I just did that 5min ago. The same problem persists, the cells are filled randomly:
Just sing up the User 1.
Database:

As you can see, the sells of the second RG filled randomly:
2020-09-20_14-03-28

I deleted the User 1 and all the data, and again sign up the User 1 after 3 minutes:

Now, the first RG is filled randomly:
2020-09-20_14-06-15

As you can see, in both cases the database looks absolutely the same but final results are different