3 months later (since I've posted the bug on github) and the bug is still not resolved (and is not a "small bug") but hey, we are used to it, like usual, it have to pass another 3-6 months until a fix will be released... if there will be a fix, because, now, they concentrate their efforts on V5 which should have been released 3 years ago :sweat_smile:
It is the material theme and it comes and goes. I don't get it. It never happens on Firefox but edge and chrome pop up with the registration form when I have an invite-only website. I am going to try to check daily and see if there is something I do differently because today it is working correctly on all three browsers. Very weird.
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From what I remember the following tables are updated when you added a new user (this was a couple of years ago so hopefully it didn't change...I don't think it did though)