Hi @KellieGardner
Your formula is basically saying "if my field is blank grab that percent complete and add it in front of the '% complete of of 9/30/22' text, if it's not blank leave it as is"
so any time the form that field is on is added to a task, that field is going to be blank and get filled in with the current percent complete and the exact text you've indicated.
Not sure if I've got the syntax correct, but you might try a new field named something like "% Complete As Of" then a formula like:
IF(ISBLANK({% Complete As Of}),CONCAT({percentComplete}" as of "$$TODAY),{% Complete As Of})
saying: "if my field is blank grab that percent complete add the text 'as of' then today's date, if it's not blank leave it as is"
**it's the syntax of $$TODAY that I'm most unsure of - not sure if you need some type of brackets around that.