Sounds like a bug, then. You should report it via the bug reporting form, and until it is fixed you can use the Temporary Adjustment "Override Proficiency Level" to set your character's Fortitude Save to Expert.
Currently Running: Pathfinder Second Edition
Currently Playing: Pathfinder First Edition, Star Trek Adventures
Former HL Games: D&D 4e & 5e, Mutants & Masterminds 2E & 3E, Savage Worlds
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