ok, i was turning on and off "wp post styles" and refreshing page to see the difference between them and select the best option for me...
i did that with both archives pages (events and locations)
while doing that, i found that my events using wp post styles were not showing a category, so i opened in a new tab the general options, turned on the event category manager and added a category, then i selected all my events and assigned the category i created... i refreshed site, and my events wp style change itself to no style and from since i havent be able to turn on style again on both archive pages
btw, i deleted the category i created and turned off the category manager too but didnt work :(
i even optimizede and repaired tables and deleted all the site cache and browser cache... nothing worked