Hi babischk,
We'd be glad to see if we can help out. We see that you're experiencing syncing issues with iCloud Bookmarks on your PC running on Windows 10. This would be expected behavior as iCloud Bookmarks isn't compatible with Windows 10.
According to If your iCloud or Safari bookmarks aren’t syncing, it states:
"Microsoft Edge browser in Windows 10 doesn’t support iCloud Bookmarks. If you want to use iCloud Bookmarks in Windows 10, use a supported browser, like Google Chrome, Mozilla Firefox, or Internet Explorer. Learn more about the system requirements for iCloud."
Moving forward, we'd suggest adding your bookmarks manually to either your iPad or iPhone. Once added to one Apple device, it'll sync to the other through iCloud so you won't have to add them for a second time. To do this, check out these support articles below:
Bookmark favorite webpages in Safari on iPhone
Bookmark favorite webpages in Safari on iPad
In addition, you may leave any feedback about this directly to Apple from Product Feedback.
All the best!