Some of them were so misshapen, it was a joke.
I decided that instead of taking them all apart and completely correcting them, I would just unpick a few seams and flatten the block, and then applique the patchwork back together.
Here is a pink block, after I had overlapped the offending seams.
You can see that the outer edges are no longer square. I solved that by adding pink strips all around, and then trimming the block to square.
That turned out to be much easier than completely re-doing them.
Of course, the star points are no longer very pointy, but that is a small price to pay for being able to use the blocks. If I had to make them accurate, I never would have done it and they would have sat in a box. This way, the quilt will get finished. And I believe strongly that when you are quilting, Finished is Better Than Perfect.