It's a little hard to tell size in the picture, but how are your picking prey items?
There are generally 2 rules of thumb I've seen people use. The first being a prey item approximately the same circumference as your snake. The second being a prey item 10-15% the weight of your snake. (Snake Weight x .15 [or .1]= Prey Weight)
It was just a thought, as if the food item being offered is to big, the snake will also refuse to eat.
Edit to add:
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