Email not auto-filling addresses

[Pyrehn]

Have been using my phone for a while (Samsung Galaxy S7) and all of a sudden it will not auto complete email addresses when I start typing them into the address line. I am using the phones stock email app synced with my hotmail account. Not gmail.

For example, when I type in "ni", previously it would bring up my friend Nicole's email address. But now it brings up Sally.Nickles email address... But when I type in "Sal" it won't bring up Sally. Nickles

I don't know what's going on.

Any suggestions?
Thank you.