Maybe an update across css js htlm not synced up due to caching issues? Evidence: enforcing a full reload (ctrl-r in chrome) reloads the page and the arrows rea

Maybe an update across css js htlm not synced up due to caching issues? Evidence: enforcing a full reload (ctrl-r in chrome) reloads the page and the arrows reappear. Also in the last few days the word "upvote" used to flash on the page before being replaced by the arrow indicating some css/js sorcery at work ;)