I would count on it being most likely a loose joint fitting also. After receival of our Pod on our first trip I brought along teflon tape, some plumbers putty and a tube of Goop ready to seal, tighten and properly align any an all pipe fittings we have once we started running water through them.
I found that several were loose, one was completely screwed on sideways, and a third pipe had the smallest little crack in it that I quickly threw a pipe clamp onto and of course used enough Goop to seal it until the end of time!
Goop is one of the things I always make sure I have in my toolbox. Nearly as versatile as Duck Tape.
Let me also say though, the first times we ever showered we got water all over the floor and that was because or our own mistake, we didn't make sure the show curtain was pulled far enough up around the door and some water was hitting the door and then running down onto the floor.
So if you are sure the shower curtain is up high enough then like Podsible Dream said I'd think it was a loose joint is all.