Thank you again for your fast answer!
I can enter a new value in the Amount field and the new value is persitent, so it may just be a misleading initial value that does not seem to affect the function.
Talking about these settings, I understand the combination of the Card Filters is interrelated by a logical AND?
I'm thinking of a way to have a setting in the History Filter for new vocabulary (e.g. not correct in row and Is >= 5) and add the expression back to the collection after some time has passed , using the Time Filter (e.g. not within and 1 month), but that would require an OR.