Mitrofanoff folks, help!!!

It's been two days that I've been experiencing dificulties to cath myself with the mitrofanoff (AFAB nonbinary). Mine is on my right side. For some reason, it feels like there is a wall of meat in the way, but I've been doing cath on myself for more than 1 year by now, idk what is happening! I had to ask my mom to do it instead, at the first 2 days she manage it just ok, but today she tried a lot of times and nothing! The fuck is wrong with my mitrofanoff???? I'm doing it in the same way as usual, I'm not tense or anything. What could be causing this?