Also, check your macros. Make sure you don't have an instant-abandon macro on your bars (I know you mentioned it, but you didn't say if you checked for one).
Lastly, if all else fails, check combat logs. Maybe if something is happening (some phase bug, or God knows what), the logs may give you a clue.
Did you check for the macro at all, in the end? It's a strong possibility!
Definitely agree with this. I have had macros as well as regular abilities appear on invisible bars with mystical keybinds, which seems to occur when I redo my UI on any toon. It was fun on my mage because I would hit some keys before alt-tabbing then tab back in to find myself in the undercity. I had a pet abandon macro for all of a day before deleting it (and quadruple-checking that it was in fact deleted) - I was so scared of that macro appearing on an invisible bar with a mystery keybind.
Have you petitioned a GM to have your missing pets restored?
(85 male undead hunter, Nesingwary)Helsinki
(85 Femtroll Hunter, Nesingwary)Andi
(85 Femgoat Hunter, Dragonmaw)Iggletron
(85 Femgob Hunter, Dragonmaw)Waggletron
(85 Puppywoman Hunter, Gorefiend)
<- May contain one or more boobies in images.