Bulk action deleted date field value instead of filling hidden value

I’m hoping for some help figuring out a bulk action issue. I have project schedule function where a user can input a number of days to increment (or decrement with negative number) a schedule. This is helpful in shifting an entire project schedule or part of it all at once instead of changing individual records. The users enters the increment value and a formula in airtable calculates the new date based on the entered value. When they execute the bulk action the event dates are replaced with the formula incremented dates. This has worked successfully for us over the last couple months (though we don’t use it often). But, recently it has been just deleting the date value instead of entering the new value. Everything still seems to be set up fine from what I can tell and I haven’t changed anything with this feature since it was previously working correctly. Help?