Do you have more than one photos selected?
Is auto-sync turned on?
Yes, only one photo is selected and auto-sync is not on. It is like I would usually edit, now it just copies the settings over to the very next photo I open regardless of where it is in the catalogue. And when I look at the history it will not show there that any changes were made to the photo. It has to be some kind of glitz or bug
Are you using raw files? It could be the result of a defective profile. You could try restoring Adobe default.
You select one image and hold down the Alt (Optn) key and the reset button (bottom right in Develop) switches to Set Default.
A dialog will open showing the camera model for which the Adobe Standard profile will be applied in future to negative (raw files)
To update click the left button “Restore Adobe Default Setings”
Thank you for the advice, I tried it as I am using RAW files but unfortunately it is still doing it. I have been using Lightroom for years but recently had to reinstall Lightroomon my PC after my PC crashed. It is since then that it suddenly syncs files by itself.