Hi Anthony,
Based on your description, please try the steps below:
- Go to Control Panel > Clock, Language, and Region > Region and Language. Check whether your Format is English.
- You can change the format by right clicking the cell, click Format Cells, in Locale dropdown menu, select the location you want then choose the Type.
If the issue persists, please share the screenshot of your Excel version and the example file with us via Private Message.
To check your Excel version, please go to File > Account.
Regards,
Tisky