Hi,
I suggest you go to File- Options- Proofing- Autocorrect Options...- Autocorrect- uncheck the option "Correct keyboard setting" and confirm if it will help you resolve the problem.
If yes, you can check the keyboard language, remove Greek langue and restart Windows.
Please be a bit more precise to explain your problem or you can upload a screenshot so that I can get more accurate solutions to this problem. I’m glad to help and follow up your reply.
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