Hi,
It seems to be working all right on our test servers, so I suspect this might be a conflict with something.
Both issues could be caused by some sort of a cache. The “check” symbol not appearing means, that the special font for it is not enqueued, so either something is dequeueing making changes to it. The most likely cause to that are a server side cache – probably a page cache/asset/minify cache of some sort. Clearing that will very likely resolve the problem.
Try clearing all caches first, and let me know if that helped. If not, then please add temporary back-end and (s)FTP access if possible, I will try to debug the issue directly.