weird bug in r-lf2

[Som1Lse]

So what must I do to fix this? Do I have to create mirrored bitmaps of all the r-lf2 moves?

Yes.
Ive made a program for that.
Find it here.

Also, why is it when I use the default lf2 launcher, it loads the default mirrored sprites? Is it because the r-lf2 .exe does not know how to load these new mirrored bitmaps?

Yes.
The new features of LF2 V2.0a is that it can load mirrored sprites. This way it solves the problem with stupid sprite problems in LF2 on some graphic cards (like mine).
The previous versions didnt have to include this feature because all the graphic cards at the moment didnt have such problems

And this also means, in the future, every time I install r-lf2, I have to experience this all over again?

Yes.
Unless you save the mirrored sprites in a different directory and move them to the R-LF2 folder if you reinstall it.