Jason had this problems too but I think he hadn't installed Beta2 on a clean POTC.I gave myself a musketoon and it was on my hip.
Could it be something like that? :huh
The install with that issue is a beta 2 on a clean stock POTC with all of the mods done since beta 2 was released. I have stopped playing that install and have started playing a clean beta 2.1 on a clean stock POTC.
The only thing I have been able to note so far is that when a soldier uses his musket it goes back on his hip and all other soldiers put it on their hip.