I had that same problem with a DJs, and ended up taking an old one from another STP and using it instead. I had put a note on another thread that you should cut them from the tip end so you don't have to take the spoon off, having screwed one up for myself doing that. I only had one like that, others were fine.
The thing I do for packing while swimming is the trusty jock strap under trunks. It holds it just fine, but does make it trickier to pee.