

Steam profile achievements issue
I am pretty sure this has been discused before, but I haven't been able to find a fix for it, and steam support has not been helpful at all.
Ok, here is the issue, me as everybody in this sub, I am an achievement hunter and my goal is reach 80% completion rate before 2027, but I have seen some weird stuff happening with my profile, as you can see in these 2 pictures provided, one of them shows 7560 achievements and 75% rate, and the other 8028 and 77% rate, they are pictures of my account and taken the same day, sometimes it shows 75% and sometimes 77%.
As you can see in the 77% pic, the most rare achievement shows is I love gambling! (0.4% obtain rate from all players) from the game Pocket Waifu: Desktop Pet (The one with the little girl playing a slot machine), this a free to play game.
And in the 75% rate pic shows the zangief one (0.5% rate from all players) from SF6.
Of course my real profile is the 77% one, including all achievements from free games too, so why sometimes it shows 75%? and 500 less achievements? (Besides completed games number), what is the pattern here?, I am really confused, and as I said, steam support has not been helpful at all.
(At the moment of this post my profile says 77% and 8000+ achievements but when I less expect it or when I get another achievement it gets downgraded again)
https://steamcommunity.com/id/rozen_d/
Thanks in advance, and have a great day everyone!