I realized how to solve this, the problem was that all the pages were showing a mix of spanish, english labels and that stuff, I tought that it was something about this

var cookie = HttpContext.Request.Cookies[CookieCultureName];

where it takes many config values such as language and that somehow it chooses one of the two .resx files that have all the labels values but it was not the case, I solved it by changing it manually on inspection -> cookies -> Localization.CurrentUICulture:
enter image description here
But I still don´t know where this value comes from, kinda weird but it is what it is