Noticed this pretty early on but wasn't sure what was happening.

Apparently, every time I load a save my characters swap their weapons (from melee to ranged and back).

I was rather confused because Lae'zel was suddenly running around with her bow out and not her starting long sword on the nautiloid. It doesn't even have to be a character's turn or for them even to be in your party. I left Shadowheart at camp with her mace and shield equipped, had saved and reloaded, popped back in to grab her for a run in the crypts and, surprise! She has a crossbow on her back. I even got to watch Gale examining his mirror image, one with a quarterstaff and one with a crossbow.
It happens every time I reload. And it seems to happen with people not in the party as well. At the battle at the druid gate, the mercenary who usually uses a bow ended up swapping to her bare fists. It wouldn't be a huge problem, except that:
A) I save scum a lot. I'll admit it. In battle mostly. So because of my save scummy nature there is a lot of weapon swapping happen in just one battle.
B) I usually have my party members holding a melee weapon when they end a turn (especially when in melee range) for that sweet, sweet attack of opportunity.

To be fair, I am using a drow druid that I made with the new patch and not with the hotfix. Don't know if that changes anything.