I've been having this issue for a while now, very inconsistently. When I type strands of text, sometimes the letters appears in the wrong order (I remember it mostly happening when I type text in Safari). One example:

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I typed "Install Canon Printer".

I am using an iMac (21.5-inch, Mid 2011) running 10.10.5, with this keyboard:

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They keyboard is plugged directly into the iMac (no hub).

Note: Sometimes I type things wrong, but AFAIK I'm not dyslexic.

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    There's actually a lag in them appearing. Like they appear by bulk. I'm thinking it has to do with packs of data being sent to the computer through USB and arriving in the wrong order but I can't explain... Hardware is in excellent condition. "Correct spelling automatically" is OFF. – MicroMachine Feb 17 '16 at 23:35
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    It also happens to me! MacBook Pro (Retina, 15-inch, Mid 2014), laptop's keyboard, MacOS 10.13.2. – A-S Apr 7 '18 at 11:11
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    Same thing is happening to me, especially at times when CPU usage is otherwise high. I've got a Matias backlit bluetooth keyboard running on Mac OS X 10.13.4. This has been happening for a few OS versions now. If this is a buffer/prioritization issue, it's possible the bluetooth bus/controller is suffering from the same issue as the USB bus/controller. I find shutting down all high-CPU apps gets the keyboard working reliably again, though this is a method for clue gathering rather than a fix – I need to be able to type no matter what! – Rick Gladwin May 13 '18 at 19:45
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    Anyone know if it's possible to set up a watchdog to interrupt other processes in deference to the USB or Bluetooth buffer? That would solve the issue if this is indeed down to resource overuse. – Rick Gladwin May 13 '18 at 19:45
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    Thanks @RickGladwin ! I agree with you that it looks like the computer is processing information for a bit, and sometimes spewing out letters already typed all of a sudden, garbled. I’ve also seen it happen on slower iPhones, actually... – MicroMachine May 13 '18 at 21:11

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