It starts with this: https://photographyconcentrate.com/lightroom-tip-turn-automatically-write-changes-xmp/
As long as all your xmp data is up to date, you can drop Lightroom and switch to Bridge any time you like.
Do you mind opening one of the older photos (that matches the screen) in Photoshop and showing me a screenshot of your screen?
Then do the same with one of the newer photos?
Whoa.
Then this can't be a problem at your end, surely?
Have you changed labs, or is it still the same lab?
Can you double-check that Photoshop's Color Settings are on "North America General Purpose 2" the way they should be?