RBM 2H mace horseback bug

Posted this a few days ago... Slight update

Having an issue with RBM mounted combat.

2H mace works SOMETIMES when mounted.

If I load in a save it works first time, but if I back out of the game and load in again, I cannot attack with a 2H mace. Really strange.

It is 100% this mod, as I stripped everything back and it doesn't happen when RBM isn't installed.

I love this mod, but has anyone else experienced something like this before?

And ideas how to fix?