Thanks for your reply, Candice C,

the rounding adjustment item I already do in QB when I see a difference between the sales receipt totals and Square transaction totals.

I have already created several tickets with Square support, also had 2 chat sessions with tech support, but the reply I got was my issue had been forwarded to their engineering department, AND to do the needed tax corrections in QB. And one comment even suggested to report it to QB tech support. 

In the Square forum I had found others complaining about rounding issues, thus, I am not the first one reporting it. 

I don't get my hopes up that Square will provide a fix any time soon (if they even will provide one at all).