Why is predictive text doubling up on some letters in e-mail?

This happens only in e-mails (it works fine for texts) and seemingly only with certain letters and characters. For example, you type "W" in and then proceed to type "ater" it comes up with WWater. The £ sign also does it. I even TeamViewered onto the phone and tried it remotely (in case it was the touch screen playing up) but it still does the same then. If I turn off predictive text off it's fine but I'd really like it on.

This started about 6 or 7 days ago. Any ideas?

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