My Instagram isn't Working.?

My Instagram account has just started playing up. When someone tags me or something similar, it no longer alerts me on my 'News' tab. Also when I try to comment on certain pictures, my comment is only displayed until I refresh my feed and my comment disappears.

I can still like certain pictures and I can even comment on some but not others, it makes no sense.

I'm on an iPhone 4S and my Instagram is updated to the latest version. I don't know why this is happening! Someone help please.

Thanks

Oh dear.

If I was you I would make a new account and deactivate your current account

You should try deleting the app and reinstalling it again.
If that does not work, try making a new account.