Why won't twitter notify me?

[Dayna]

I set my twitter up so when all the members of one direction, and the one direction account tweet ill see it. All Ii want is for them to notice me, and lately I haven't been getting notified (iPhone4). I sometimes get random ones, but I usually get 4 out of the 20 they tweet. But I see their tweets when I get home( on my laptop). I turned off all the notifications today, and then turned them back on but it's still not working... Is it twitter or my phone? Is there a way to fix it? Thank you

[10 p0ints]

There may be error on twitter.