Platform: Android 10
App version number: 2.31.1 (232)
Description of problem:
Step 1: on the start page, in the list of species seen nearby, open a species not yet observed
Step 2: Confirm the (absence of an) observation date
Step 3: go back and open an already observed species (indicated by 
)
Step 4: Check the observation date
Step 5: Open the first observation again (and others as well) - now the same observation date is shown for every observation
