I used them myself and never had any issue with them. But I did make sure when I installed them I pushed the bra in at the center of the rubbery plastic to allow some air to escape out from around the edges and that made then have a little vacuum to help hold them on. You might try that next time. If you simply install them, any internal pressure could actually push them off. :noidea:
If i only had the problem during my teen dating years... :facepalm: