It is normal. See in Forms help:
About recalculation of calculated items
Form Builder automatically marks a calculated item for recalculation whenever the value of a bind variable involved in the calculation is modified in any way.
Note that actual recalculation doesn't happen immediately. It occurs sometime after the item is marked but before the new value of the calculated item is referenced or displayed to the end user.
Your application's logic should not depend on recalculation of a calculated item occurring at a specific time.
Record Status: Recalculation does not change the status of a calculated item's record, even if the status is NEW.
And, the Formula (or Summary) item is automatically (implicitly) non-database item.