Hi again, o.k, I`ll take you seriously!
I really don`t know how you can say there`s "tons of space" in an 8inch high plastic tub??
How are you creating a temp gradient in something that small?
Looking at the pic, I would say it`s the hemipenes, although if the monitor cannot retract them, it`s a problem. Have you tried (extremely gently) pushing them back in, if yes, and it doesn`t hold, either see a vet, or take the animal back.
If you`ve kept these animals previously, why didn`t you construct a proper enclosure first (I`m not trying to insult you, I just don`t understand)?