Hi, Laurzel78
Welcome to Google Maps Community Support Forum & thanks for your post.
Crossed out dates mean there are no visits on that day.
Dot means Maps wants you to confirm the guesses & expects you to edit or confirm the recorded visit.
However, when Google Maps is confident about your visits, those dates will be blue without any dot.
Nevertheless, you can edit those days also & fix any possible errors.
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Volunteers answer the queries in this peer support forum.
We, volunteers, are users of Google Maps like everyone & do not have any special privileges to make changes in Google Maps.
Google employees or representatives aren't reading the posts usually.