Why are passwords visible on someone else’s device
Why are my passwords visible on someone else’s device keychain
iPhone 13, iOS 16
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Hi Kristabella,
It may be able to happen if you let somebody else log into your iPhone without erasing it first, or you logged into their device without erasing it before and after. In that case the only resolution is to change all your passwords so the old ones are no longer valid.
Of course it will also happen if the other device is signed into your Apple ID. The solution then is to get the other user their own ID, sign out of the device on your ID, do the things in this document: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support plus change all your passwords just to be safe since the other person may have seen them.