Hi,
Please understand that we don't read Dutch, so it's hard for me to check that your settings are all correct on your screenshot.
To me, I would indeed recommend to turn off the "synchronize" option as you don't want that on a "newest products" module.
And no, we didn't change anything regarding the carousel system, and even if we did, it wouldn't impact which products would be displayed by the carousel system.
To me, it's just a module settings issue, and you had that problem before the update, and you just realised after the update because you went and checked for strange things on your website.