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Describe the Bug:
I had Deathrender equipped on a token and attacked it died in combat and Deathrender triggered I chose to use it, my hand was opened and chose the only creature which was Gigapede it came correctly onto the battlefield but then Deathrender was attached to it despite having shroud.

Which card did behave improperly ?
Deathrender

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/01/15: Battle For Zendikar v2,duel

What exactly should be the correct behavior/interaction ?
Deathrender can put a creature card with shroud onto the battlefield by it's ability since it doesn't target (put creature onto the battlefield) but can't be attached to it since attach is a targeted ability.

Are any other cards possibly affected by this bug ?
-

No, Equip is a targeted ability; attaching isn't.

Relevant rules | Open

301.5. Some artifacts have the subtype "Equipment." An Equipment can be attached to a creature. It can't legally be attached to an object that isn't a creature.

301.5a The creature an Equipment is attached to is called the "equipped creature." The Equipment is attached to, or "equips," that creature.

301.5b An Equipment is cast and enters the battlefield just like any other artifact. An Equipment doesn't enter the battlefield attached to a creature. The equip keyword ability attaches the Equipment to a creature you control (see rule 702.6, "Equip"). Control of the creature matters only when the equip ability is activated and when it resolves. Spells and other abilities may also attach an Equipment to a creature. If an effect attempts to attach an Equipment to an object that can't be equipped by it, the Equipment doesn't move.

301.5c An Equipment that's also a creature can't equip a creature. An Equipment that loses the subtype "Equipment" can't equip a creature. An Equipment can't equip itself. An Equipment that equips an illegal or nonexistent permanent becomes unattached from that permanent but remains on the battlefield. (This is a state-based action. See rule 704.) An Equipment can't equip more than one creature. If a spell or ability would cause an Equipment to equip more than one creature, the Equipment's controller chooses which creature it equips.

301.5d An Equipment's controller is separate from the equipped creature's controller; the two need not be the same. Changing control of the creature doesn't change control of the Equipment, and vice versa. Only the Equipment's controller can activate its abilities. However, if the Equipment grants an ability to the equipped creature (with "gains" or "has"), the equipped creature's controller is the only one who can activate that ability.

301.5e An ability of a permanent that refers to the "equipped creature" refers to whatever creature that permanent is attached to, even if the permanent with the ability isn't an Equipment.

701.3. Attach

701.3a To attach an Aura, Equipment, or Fortification to an object means to take it from where it currently is and put it onto that object. If something is attached to a permanent on the battlefield, it's customary to place it so that it's physically touching the permanent. An Aura, Equipment, or Fortification can't be attached to an object it couldn't enchant, equip, or fortify, respectively.

701.3b If an effect tries to attach an Aura, Equipment, or Fortification to an object it can't be attached to, the Aura, Equipment, or Fortification doesn't move. If an effect tries to attach an Aura, Equipment, or Fortification to the object it's already attached to, the effect does nothing. If an effect tries to attach an object that isn't an Aura, Equipment, or Fortification to another object or player, the effect does nothing and the first object doesn't move.

701.3c Attaching an Aura, Equipment, or Fortification on the battlefield to a different object causes the Aura, Equipment, or Fortification to receive a new timestamp.

701.3d To "unattach" an Equipment from a creature means to move it away from that creature so the Equipment is on the battlefield but is not equipping anything. It should no longer be physically touching any creature. If an Aura, Equipment, or Fortification that was attached to an object or player ceases to be attached to it, that counts as "becoming unattached [from that object or player]"; this includes if that Aura, Equipment, or Fortification leaves the battlefield, the object leaves the zone it was in, or that player leaves the game.

702.6. Equip

702.6a Equip is an activated ability of Equipment cards. "Equip [cost]" means "[Cost]: Attach this permanent to target creature you control. Activate this ability only any time you could cast a sorcery."

702.6b For more information about Equipment, see rule 301, "Artifacts."

702.6c If a permanent has multiple instances of equip, any of its equip abilities may be activated.

There's a ruling for Deathrender that's maybe a little misleading in this context -
10/1/2007: If the creature you put onto the battlefield can't be equipped by Deathrender (due to protection from artifacts, for example), the creature enters the battlefield but Deathrender remains unattached.
but that's part of protection, not of attaching.