My facebook notifications are acting strangely?

[Meghan Thomas]

Recently I've been getting notifications like 'someone has commented on your post' and when I go to the post it's not showing any comments, it also won't let me comment on posts but when I go on someone else's computer it all shows up.
I've also just tried to upload a profile picture and it wouldn't show up on my computer. I tried this again about 3 times and nothing came up, although I'm worried that it will show up 3 profile pics for everyone else :')

This is making facebook virtually unusable for me and it's the only free way I can contact my friends and people at work except from email and I'd really like to know what I need to do to get these weird glitches out of the way. I've tried opening facebook on chrome, firefox and even internet explorer to see if it works but it doesn't on any of them can anyone tell me how to fix this?
Thanks in advance!