OK getting back to this question.
So the website does work on a different pc but my main one still can't access the website (for example when I try to log in it just refreshes the page, same when I try to change the theme, refresh without any change) and i'm not sure if it's either a caching problem ( I already cleaned all my browser, even used ccleaner) or a ssl problems (I had multiple ssl on this domain. )
So basically the problem is I cannot log in, change the theme, I cannot do anything other than viewing the website, this happens on more domains that I have on this hosts so the problem isn't from IPB but honestly I cannot figure it out, does anybody have a clue what could be done?
PS: I used different browsers (Firefox, Edge, Chrome, first 2 in a clean state) but still nothing, there must be some cache on my computer that doesn't allow this or maybe a dns problem.