Poop....?

[Lioness]

hey everyone..i have a bit of a problem..
when i fed my corn on wednesday..and by sunday i was cool to hold him again..so i was holding him..and usually when i have him i let him roam on my bed and stuff..and well..every time i let him go on my bed..he literally GOES on my bed. he's did it on sunday, and again today. oh and this isnt the first time..he's pooped on me before..and on my mother's bed before. not sure why he poops in and out of the tank.. does anyone have a clue as to why? any info is appreciated