Hi,
I noticed that the issue only occurred on your Excel application. Other computers can work fine. If that is the case, please try the following steps to narrow down the issue:
1. Disable any third-party add-ins in Excel: File > Options > Add-ins > COM Add-ins.
2. Start Excel in safe mode and confirm if the font is italicized: Press Win+R to open Run, type Excel /safe, press Enter.
3. Go to Control Panel > Programs and Features, select the Office application, click Change > Repair.
Confirm if the issue can be resolved.
Regards,
Winnie Liang
TechNet Community Support
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