if I place a slope west to east (ascending) things are fine
if I place a slope east to west (descending) the texture for the south facing side is rotated 180 degrees

this is the latest version of all the mods, so if it's been fixed in a later version than that modpack has, apologies

MC version?
Forge version?
FramedBlocks version?
Do you have OptiFine and/or FerriteCore installed?
Please provide a screenshot of the blocks

it's 1.16,
All the Mods 6 v1.5.7
Framed blocks 2.4
Forge 36.1.2

And I went to get a screen and it seems fine now... very strange, must have been a client side glitch... if it happens again I'll screen it

got it
https://imgur.com/a/7IsMJaz

Known issue, see #6 (comment) for the solution.
When I know that FramedBlocks 2.5 is stable, I will mark it as release and hopefully ATM updates to that.