This is in the skyfactory 4 modpack version.
The manufactory flips its rotation axis when you put an item in it and theres a block infront of it.
setup:

block infront

item in:

flipped:

This does not happen if there is a block on both sides (in this case east and west)
This is an issue mainly because if you make a chisels and bits block to go infront of it, it flips around.

Good spot! Unfortunately, I don't think this is fixable, at least without compromising the logic which determines the direction the machine faces when it is placed - I am pretty sure it is a consequense of how I implemented the idle and active states of the machines (using distinct blocks rather than blockstates), because it doesn't happen in NCO. Hopefully it isn't too much of an issue!