The day after I run a mail merge, the header of the "Mail Merge Status" column changes to the following formula:
CONCAT("Specify scheduled date in this format - ",to_text(now()))
When that happens, I am still able to run the mail merge. However, if I leave it like that, the following day a new column appears next to the last column that says "Specify scheduled date in this format". I cannot run the mail merge with this extra column (if I try do to that, there is a warning that says "cannot run mail merge because of extra columns"). I am attaching some images so you can see these changes.
How can I fix this? A few weeks ago, these random changes never happened. The header of the "Mail Merge Status" column never changed to that formula.