The issue started when iOS 11's predictive text feature began to display an odd character in the place of the letter "I," offering up "A[?] instead and autocorrecting within the message field...The bug was also covered by MacRumors, but it appears that my colleagues have even more issues than just the letter "I." One reported that they were also seeing the glitch with the letters "U" and "O" as well, making the problem strictly restricted to vowels. They also said the letters showed up oddly in iMessage on Mac devices, and shared some more screenshots of what the glitch looks like when they went through with sending a message. The glitch wasn't just limited to iMessage, however. My colleagues shared screenshots of their increasingly futile attempts to type out messages on Facebook Messenger and Twitter.