Yeah, you’ll want to keep those inside edges touching and not overlapping. It doesn’t have to be ‘perfect’ as you will be filling the gaps with thickened epoxy in later steps. But you definitely don’t want it to be overlapped. Personally, I had issues with this as well. Per the instructions I didn’t glass that joint past the cut lines. But as a result I found that one side was being very difficult and would break the CA glue. Ultimately, I did what @ArtisticAdam did and simply put in a stitch to hold it in place and that solved the problem.
-Adam