I don’t know what issues in particular, but I was reading something on the WT GitHub a couple of weeks back where it was said that the G3X has some code that clashes with the G1000 / G3000 code. I don’t remember the specifics, but many have confirmed that removing the G3X solved the issue they were having.
That said, the inverted Y the OP posted about, I have seen on both the G3X and G1000. The G3X used to be packaged with the VL-3 Rotax 915 mod initially. They’ve since removed the G3X from the VL-3 915 mod package and require it to be downloaded separately. So if the OP installed the VL-3 mod from an older package, it would also have included the old G3X without his knowledge. And it’s not contained in the VL-3 mod folder, but the Community folder. So removing the 915 mod wouldn’t fix the issue if the G3X is still there.
Now I don’t know for sure that this is the problem, but seeing how it’s related with using the VL-3 mod, I suspect the OP has an outdated version the G3X mod installed without realizing it.