Your BP does not have the spider gene he has some motion/neurological issues which can be caused by a number of things IBD usually being very last as it is rare.
People jump the gun when it comes to IBD my advice stop googling symptoms imagining the worse and if you really have doubt take your snake to a vet and get a test done since there is now a blood test that can confirm IBD.
It can be caused by being over-heated at some point which can be permanent or temporary, chemical exposure etc