Makes sense although that's pretty poor considering the filters were only in use for 90 minutes and in freshly showered & Q-tipped ears.
Also unusual that the 'clogging' vanished by simply removing then re-installing the (same) filters, with the fairly minimal contact that requires.
(Although this may be a coincidence as around 18 hours had passed before I tried the PFEs again - enough time for the filters to have dried out.)
That could happen to any IEM with similar filter, like TF10, Westone or Shure. If that is indeed the cause, you will be better off with a dynamic based IEM as they hold up better with moisture.