we have found that EasyList removes whole CSS on some czech news servers (for example idnes.cz and novinky.cz). It doesn't happen on every page, but it happens on
https://ekonomika.idnes.cz/coop-zavreni-prodejen-ztraty-d21-/ekonomika.aspx?c=A171122_160933_ekonomika_are
I'm using uBlock and if I disable all filters except EasyList (or EasyList CZE, the problem is in both), the problem persists. If i disable EasyList and leave everything else enabled, the problem disappears.