Check the battle log - no indication that the parry failed or even triggered (no screen animation either), then it discarded. I'm like 99% certain that my character was facing the mold. Am I onto something, or am I missing something?
I finally looked at your screenshot, then remembered something and looked at the card again. Was your Parry visible for any reason? Poisoned Pseudopod Immediately discards your oldest visible card (before the Parry could have a chance if visible).