Is this showing up for you on all toilet or just a few of them? I have noticed it happening only with one of the City Living toilets (the cheapest tall toilet), but not any others. It might have happened on one of the talking toilets, but I can't recall clearly if it did or not. In any case, it was just the City Living toilets. I always do the eco upgrade first and then do the instant upgrade next. That works on every toilet for me except that one and maybe the talking toilets from CitL.
Hope this helps.
I had it consistently happen on the Seasons and the Tiny Living toilets.
