Ugh, I am closing my eyes and calling this down.

33 is such a small part of PF calling range. With the exception of maybe 67s/A6s, the PF calling range would have to be really loose to include 6x, J6 or 36.

This could very easily be a regular flush draw or paired flush draw semi-bluff (J10s, AJs, etc).

If you lose here (and it's not 33/67s/A6s), make a note and adjust your game to exploit an abnormally WIDE PF calling range.