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I recently ended up with this problem and it's driving me insane. I use the adjustment brush often and it has been very targeted in the past. Whatever I brush over is what gets selected. Now, it is acting like the magic Lasso tool from photoshop. I can have a small selection of a wall and it will then adjust the whole wall. The brush will then often stop working completely. I can have the mask overlay on and see what it selected on its own but then I can select another area on another part of the photo and it will not do any adjustments at all. The Pin for the adjustment will also be in a corner and not over the area I brushed.
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The first you can try is to reset the Lightroom preferences.
https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/
If this doesn't help we need more informations.
Which operating system do you use (please post the exact version number)?
Do you have installed the latest version of Lightroom 5 (it's version 5.7.1)?
Has this worked in the past? If yes, what has been changed on your system before the error occur?
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I was able to figure it out and it's a bizarre glitch. Under lens corrections, profile, you have the ability to add distortion to the image. Now I often shoot with wide angles and I use this to flatten out the image. Apparently, applying the distortion, either before or after using the brush, distorts the brush as well. So if the image has not been distorted, I can use my brush and it will apply the affect where I need it. If I then add distortion to the image, the brush adjustment will then affect more of the image as the distortion goes up.