Had 3 Waterweb Wanderer in inventory, caught 1, now have 1 again.
Version 1.2.76. Previous 3 fish caught on earlier version(s).
Edit: now reset back to 3 after changing quadrant.
Edit 2: after logging in again, I now have 4 fish.
Same thing is happening with Ebbtide Emperor fish. Inventory resets to 1 after catch, then shows correct number when you log in again.