Well, something is wrong.
Wrong parts, wrong installation, or just a stupid mod by a previous owner that you still haven't found.
You need to take it apart and look while the springs are out.
Just coming back here and telling us 'negative' on everything we give as a possibility doesn't move anything forward.
The rear is setting up too high, so now you gotta take it apart, no matter what, so do it and go through it with a fine tooth comb.