My problem is that when I highlight some text (doesn't matter where or in which application) in order to write over it the cursor, sometimes, suddenly changes position causing a lot of typos.

Let's say I've searched the phrase "stack exchange apple" in Google.

Now I want to search for stack overflow so I first highlight "exchange" and "apple" this way:

highlighted stack exchange

and then I simply type "overflow" in order to write over the highlighted text. What I sometimes end up with is this:

wrong stack overflow

And I can assure you that I didn't press any arrow keys or trackpad or mouse button of sort. I simply wrote in the keyboard "overflow" but what happened is that after I pressed "O" the cursor changed position and the word ended up like this.

I'm running macOS Sierra v10.12.4 on a Mid-2014 15" Macbook Pro

Are there things that can fail or settings to help with this?

  • Any chance your palms could be close to the trackpad? If it happens in all apps, all the time, a hardware repair might be needed. Tough to tell without seeing video of your setup in action or being in the room as you type.
    – bmike
    Commented Apr 12, 2017 at 10:11
  • @bmike I know, it's a hard question to post online. I can assure you that my palms are not on the trackpad nor near it. in any case I just wanted to know if this could be a known bug and if there could be a fix for it. But form what you're saying it's probably better to bring the laptop to an Apple Store and see what they can do. Thank you. Commented Apr 12, 2017 at 11:56
  • Turn off autocorrect and see if it keeps happening. I've encountered this problem, and it's just a bug in the latest OS update I believe
    – Stephen R
    Commented Apr 12, 2017 at 12:52
  • @StephenR Doesn't change anything Commented Apr 12, 2017 at 13:14
  • Can you reproduce this with an external keyboard?
    – Philippos
    Commented Apr 12, 2017 at 18:08

2 Answers 2


The most likely culprit once you rule out Bluetooth mouse / trackpad and any wrist or liquid input is hardware.

If you can reproduce this on a clean os install onto an external drive (to avoid wiping your normal drive and files and apps) it could be:

  • failing battery pressing underneath the trackpad
  • failing or damaged capacitive sensing grid
  • failing chip that processes the capacitive touch sensor

It's unlikely to be software, but I'd still download and install a clean and updated os to be sure unless you have close and easy access to hardware service.


Same exact problem. I'd be very surprised if this were a physical issue. I have the same problem on two separate Macbook Pro's. Also happens in multiple applications. There's definitely no mousepad bumping either. Unfortunately, the behavior difficult to reproduce.

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