Hi @Sacky, and welcome!
This sounds like a configuration being saved problem. I don’t know what else it can be. But Try and delete the cache and see it that helps:
rm -r ~/.cache/*
This deletes everything in the hidden (.) cache directory in your home directory (~/), directories and their contents included, (-r).
Re-login and reconfigure your KDE. see if it helps. If not, I think you’ll have to reset KDE config and start from scratch. More here:
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