I reuploaded the current version of the editor with fixed copies of these graphic sets, since it's unlikely there'll be an update too soon. I also included the LPIV Clockwork set in the re-upload.
For those who already have the latest version, and just want to get non-broken copies of the Cheapo styles, I've attached them to this post. Pop them in the styles/Cheapo folder. This is only nessecary for the editor; NeoCustLemmix's copies of them aren't missing the one-way arrows.
Please make sure that if you have old-format copies of the graphic sets (ie: "g_xxxx.dat" and "v_xxxx.dat", instead of just a single "xxxx.dat" file), delete them. This is becuase, due to format limitations, the old-format versions of them add empty space to the right edge of all terrain pieces and objects, which causes these positioning issues with horizontally-flipped pieces. When they're then used with the new-format versions of the graphic sets, these placement issues occur. I haven't yet put together a tool to fix this.