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Ok - sorry. I have taken a look at this last night and this is going to involve more than I am comfortable with or want to take on.

The issues start with the jQuery UI Core library. Your theme is supplying it's own version instead of using the standard WordPress supplied one. It has been renamed to include the word 'custom' which makes me think it has had code changed. If you swap this out for the proper version then errors start to pop up all over the place suggesting that they have indeed, altered the standard library. So there is a bot of a cascade of problems with that theme.

And this is all before the problem with the non-supported Bootstrap is dealt with. It was worth a look bit needs more work that just a few calls moved around.