A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi Jen,
There are possible reasons why you're experiencing this problem. This could be an issue with the Excel app itself, incorrectly configured drivers or system update. The support page on this link mentions the borders issue. For us to resolve this issue, we suggest that you install KB4011165. Detailed steps and information on how to perform this are all provided on the link.
Let us know if this will help address your concern.