An annoying problem with electrode sucked into the rectum

I am using a neen pericalm device for the pelvic floor. I have four different electrodes, but only one works well (for me) and the result is starting to be positive. The only problem is that the electrode (I hope that's what it's called) is literally sucked into the rectum and it's quite annoying to remove it at the end of the session (I even have to simulate a BM to push it out). Is this normal?

Noticed on their website they don’t make that model anymore. No idea what probe you are using or why you would have that problem. The only image I saw appeared to have a flanged end to prevent that.