Could you possibly post a picture of your two blocks side by side? It would be easier to figure out what the problem might be.
Oh just re-read your post and also checked a picture of paths and stiles block. Yes it very well might be your pressing. Is the striped block the same size or narrower than the others? You might have to make your seams on the striped block a thread or two smaller.
Last edited by GingerK; 11-17-2016 at 05:54 AM.