On my iPhone 6s, running 10.3, when I move an email into a folder, it stopped suggesting a folder to move the emails into. I have not changed my patterns in how I sort out my email, and generally, the folder is determined either by the sender, or by an auto-generated (consistent) email subject. I tried removing the account and readding, and it did not help. In the meantime, I bought a new iPad, also running 10.3, and it is successfully suggesting where to move the messages on the same email account with no issue. Any suggestions?