Has anyone ever done a refund check workflow?

Currently struggling with this. We currently have If Invoice:Balance Due < 0.00, then people within our org are sent an email notifying us that someone needs a refund/has requested a refund. This is to help avoid people overpaying on accident. The workflow starts when a record status changes, and it's meant to be an automatic process. It's running in the background as well. 

Can anyone lend some assistance? TIA. 

Addition: We are using classic workflow. 

EDIT: Figured it out. I changed the trigger from 'Records status change' to 'Records field change'. Hope this helps someone else out in the future! Much love from 2024