I exported some portait edits I had been working on then shut down LR. I noticed a change I wanted to make to one image, re-opened LR and noticed that every brush position had moved on each image - across the board. I am dumb-founded and cannot figure out why or how to reset them.
Did you make backups of the catalog in advance? If yes, try restoring them.
For photos that you want to delete the brush adjustments, there is a quick way to accomplish this: Double click the word “Effect” in the Adjustment Brush Panel, or hold down Alt/Opt to watch it change to “Reset”. Click this to reset the entire Panel.