https://wccftech.com/many-users-complain-about-a-new-autocorrect-bug-that-changes-it-to-i-t-automatically/

Autocorrect on its own can create troublesome replacements for individuals at times. It randomly takes over a word that you spelled correctly and replaces it with something entirely different. Recently, a few days ago, Apple had fixed an agonizing bug that when the letter “I” was typed, it would automatically autocorrect to “A[?]”. Moreover, Apple had fixed it in the iOS 11.1.1 update. Now, it seems that some sort of a similar bug is causing hundreds of users to complain that autocorrect is changing “It” to “I.T” without a user’s consent. So let’s dive in to see some more details on the matter.

As we have mentioned earlier, the new autocorrect bug is changing “It” to “I.T” which is quite a nuisance. What the problem is that the QuickType suggestion will show “I.T” as the first replacement option and once you tap on the space bar after putting the word that you want, the replacement would automatically be added.