Hi Ingunn,
I have read your post carefully and I want to share with you my idea.
As you said, the Cursor misalignment is always associated with version, so I suggest you downloading MAU 4.10 then open Excel, go to Help > Check for update.
The latest version of Office for Home is 16.24, you could click HERE for details.
If the issue still happen in the latest version, Please try Join the Office Insider Program and update Office to 16.25 version see if there is any improvement.
Does the same issue happen in other office applications(like Word or PowerPoint)?
Regards,
Eric