Spell chess

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c-h-e-s-s

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I assume what happens is when the jump spell is used it treats the piece there like it doesn't exist. That might run into a problem when you try and capture it, since it doesn't exist currently. But it still has to show the piece on the board. Then you have notation, you can't take a square, or occupy a square that's already occupied, so the computer just treats the square like it doesn't exist because it's just too confusing. I don't know though, you'd probably need to ask the developers to find out the actual answer.

Ok, the only other thing I can think of is that pieces that are checking your king are assigned some kind of unique value while checking that makes them immune to capture when the value for the jump spell is added. Maybe the two combined confuses the computer in some way.

I really hate the terminology for a "jump" spell. If I cast a jump spell on something, I expect it to be able to jump, not get jumped over. I think if they changed the name to "phase out" or "blink" or something that implied the piece it is cast on disappears for a turn it would be more intuitive.