If you're making more typos in iOS lately, you're not going crazy - it's a bug in iOS that causes the keyboard to randomly insert the wrong letter instead of what you typed.
It’s not a bug or a random letter, you selected “u” then slid your thumb over to “j” before releasing it. The keyboard is programmed to input the last letter you selected. Don’t select slide, tap and you’ll be fine.
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Replying to @glamorousdagger
That would trigger slide to type and start a new word. If I enter T-H-U-slide-J-M-B on the keyboard, it would insert the text "th UK mb".

Oct 21, 2025 · 11:56 AM UTC

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Your both right! Try it, type thj (i just did it by typing thu but sliding from u to j quickly)