Hi jerdav89,
Thanks for using Microsoft products and posting in the community, I'm glad to offer help.
According to your description, it seems that the problem only affects the specific "downloaded Excel data", in this case, you can try to copy the data to a newly created workbook to check the outcome.
If the issue persists, would you mind sharing the file with me via Private Message for further investigation? You can click here to check your inbox if you are willing to share.
Best Regards,
Arck