Kind of an annoying glitch here. I make some settings for the adjustment brush, paint them to my photo, then I move on to the next and I have to readjust all the sliders againwhen re-using the tool.
The thing is, it remembers and applies the previously used setting for the gradient tool. It's been this way for far too long. Why is the gradient tool the 'dominant' tool here? Why can't the settings for each tool be retained on their own?
Sorry that the Adjustment Brush tool in Lightroom is not working as expected for you.
Which version of Lightroom are you using and on which OS?
Adjustment brush settings are local for each image you work with and are not retained once you hop over to edit the next image. You may "Copy Settings" for that particular image and paste it to the next image.