We had issues with ours, (ball was catching the rear edge of the seal & pulling it down).
I separated the bowl from the base, removed the seal, & found it was quite deformed.
I cleaned the seal with a used toothbrush and Dollar General scouring sponge.
I reassembled rotating the seal 90° clockwise. It still failed to hold water, so I poured in several bowls of straight HOT tap water over two days.
Lo & behold after 3 days it now holds water just fine. I will be ordering a spare for just in case not a priority though.
BTW I spent a bit of time fiddling with the alignment to get a symmetrical fit to prevent the ball grabbing the seal again.