The badge is not related to your local progress, otherwise anyone would cheat it.
Badge has started to calculate the days since update 1.8 when it has been introduced

Then I do not understand with what progress this is connected. The second screenshot shows that since the release of 1.8, I have not yet missed a single day. And since version 1.8, I complete all daily quests on normal difficulty. And since I have been in the game every day since 1.8, the number of days on the badge should be equal to the days since the release of this version (I updated on release day), which is not the case.

Also for several days there was a problem with the processing of replays on the server - perhaps this is the reason.
Also, if you are counting the days on which replays came to the server, then it might be more correct to consider the local date of such a replay, but for a limited time period. If someone today does not have access to the Internet, for example, but tomorrow he will send a replay, then it seems that there are no ways of abuse and cheating. Even 5-7 days seem to be ok.