Second time i purchase a Thomman rack, similar story. It came in a good package, but the holes are not aligned so makes it pretty difficult to use it fully, you hace to keep empty spaces becayse you cant screw units together. I had the same problem before, with extra stripped threads.
If fo dont mind having to remake the holes and the threads or you are okay with letting spaces as the rack rails may be constructed, this is for you, for me, is the last one i buy, im done.