Clone Stamp always negative or weird dark colours

[defaultbow0gys8w75s]

I recently upgraded my OS and then updated to latest versions of Adobe Photoshop and Lightroom. Now the clone stamp always shows black or some weird really dark variation or negative of the colour I'm cloning every single time. I've searched Google and Youtube for terms like 'clone tool always black/dark/negative' etc but finding zero results. It's the 2021 version on PS and no further updates are available.

Am I really the only person on Earth having this issue? It's really screwed with my work flow and put me under pressure as I shoot real estate and typically use this tool on every job.  I've checked all the settings I can think of such as brush settings.

I really hope somebody can help - maybe even Adobe! Cheers

[Marja de Klerk · Accepted solution]

Hi, It's the mode that is set to Difference! Bring it back to Normal and your Clone Stamp will act normal again.

[defaultbow0gys8w75s]

Problem solved. I have no idea how that setting changed or why it would default to Difference with the upgrade. All that matters is now I know so thank you Marja nuch appreciated that's a big relief I can resume normal workflow again. Cheers

[Marja de Klerk]

Happy I could be of help!

[daffodilhill]

I am having a similar issue, however mine is just making it darker, and I have made sure it is set to normal on both the layer and the clone tool 

[daffodilhill]

I did the squiggles to show. I'm just trying to clone the dotted lines in but the blue area is showing darker. 

[sarahs67687461]

Hi there. How do I edit this mode? I can't find the setting.