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Hello @1Sakib and welcome to the community.
You aren't the first person to notice/complain about this issue and if you search you will find quite a lot of comments on the subject. As far as I can gather the issue with your highscore is caused by some kind of glitch in the system, but I don't think I have seen a fix suggested for the problem.
Overall I think @Freddy_ or @Crazy Cat Lad might be better placed to help you than I am.