So i finally fix it, looking at the journal log i found this:
then i though… could it be that simple? what i did was to switch the language and locale of the user nextcloud account that were having the issue to English US and English (United States) and voala!, problem solved lol, after hours and hours of searching on the web and posting on forums without been able to find any clues, i finally manage to figure it out on my own, i hope anyone that come across this error can find peace with this post 