I've been using Raft Extender almost since I first started playing ARK. I've never had a problem with it. Recently, I had the problem where there was an update and some of my mods disappeared from my server. Of course. Raft Extender was one of them. I logged into my game (single-player) and didn't even realize that my extended raft was gone. The structure I had built upon it was still there, but the raft was gone. Luckily, I used S+ to build, so I disassembled and stored all the parts. I build a new Raft Extender raft and started rebuilding. I build the 8 foundations to cover the raft itself (leaving an opening at the tiller to get to it from below). I then build one more row on the front all the way around. However, when I attempted to build one more row on the back of the raft, I couldn't place foundations (or the ceiling required for them) on the two corners. These would be two full foundations behind the raf, on the 1st and 5th in the row. In other words, my raft up front it 5 wide. I can place the middle three on that row, but not at the two corners. I used to have a huge taming pen back there, and now I can't built out on it.

Any idea why?