What's wrong with them? Can you specify your problem in detail? Or you can try these simple solutions.
- Check your iPhone and Safari Settings to see whether they are correct. Go to the Settings > Passwords & Accounts > Autofill Passwords, and check if this button is toggled ON. Next, go back to the Settings > Safari > Autofill, then enable the Use Contact Info option.
- Enable iCloud Keychain. Go to the Settings > [your name] > iCloud > Keychain, toggle the switch next to iCloud Keychain to set it to On. Next, back to the iCloud page, toggle the Safari app from the list of apps.
- Force Resync Keychain. Go to the Settings > [your name] > iCloud > Safari, disable it, and choose to Keep on My iPhone. After a while, toggle the Safari option again. Next, toggle the Keychain option to disable it and choose to Keep on My iPhone. Finally, toggle the Keychain option again after a few seconds to enable it.