Im not really sure, its been a while. But yeah, there did seem to be missing some pieces. I added this square. I think that should do it? Let me know if not.
Willibab: your tile sets are AMAZING. I purchased the whole bundle and really appreciate all your effort. I'm going to try to create a small online JRPG with them.
I believe the water tiles also have this gap and attached a photo where a center piece without any borders is missing. Left side is your awesome sample photos, right side is what I've been able to auto tile from what's available.
It's possible I'm missing something and holding it wrong as well.
Thank you again for all the hard work.