Twitter Alerts Not Updating in Notification Centre On My iPhone

Hi, I am hoping someone will be able to help me.

I have an iPad 2 and an iPhone 4. Both devices are running on the most recent iOS software and both have the notification centres and apps within the notification centre set up the same way. But all of a sudden I have stopped receiving twitter notifications on my iPhone. My account is fine and I can send tweets from the phone (tweeting from the gallery and tweeting from safari etc).

The notifications come through on my iPad as normal but the iPhone is displaying twitter notifications from 5 days ago but nothing recent despite having been sent many today alone. When I get a tweet sent to me, it alerts me on the iPad but not on the phone at all. Last week, it was notifying me on my iPhone the same way as my iPad. I get all other notifications on my iPhone and iPad as normal, Facebook, eBay, iMessage and email. All of those are set up in the same way on both devices and notifications come in at pretty much the exact same time, as usual.

Twitter has just stopped on one device.

Going in to the Notification settings on the phone you can see it set up the same way as my iPad. I have deleted my account from my phone numerous times, hoping that when I re-enter my account details it will right itself but to no avail.

I haven't done anything, it just stopped. The only way of knowing I have even have twitter messages or notifications when I am away from my iPad is because I get an email alert.

Is anyone having the same issue? Has anyone heard of this problem? Has something turned off on my phone that I am overlooking? Can anyone offer any advice on how to correct this problem?

Many thanks!