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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 Apr 12 '17 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. – jackscorrow Apr 12 '17 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 Apr 12 '17 at 12:52
  • @StephenR Doesn't change anything – jackscorrow Apr 12 '17 at 13:14
  • Can you reproduce this with an external keyboard? – Philippos Apr 12 '17 at 18:08
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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.

-1

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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