
Hello, This could be down to a few reasons:
OneDrive for Business is designed for work or school, while Personal OneDrive is for personal use. If you're using both services, they may appear as separate folders.
If you have multiple Microsoft accounts signed in on your Windows 10 system, each account may have its own associated OneDrive folder.
If you upgraded your system from an older version of Windows, or if you migrated data from an old system, this might result in multiple OneDrive folders.
It may be worth to uninstall OneDrive completely and Re-installing it, Signing in with the main account you use.