Twitter not forwarding messages

Twitter is used to get the updates of your dear ones or friends either on PC or you can choose a device like cellphone to get the updates. This is a cool thing to get connected with your friends and know what they are doing.
I have started using Twitter sometime back and found it pretty impressive as one can also use it to publicize their sites or blogs.
But recently there seems to be a bug in it, as it is not relaying (forwarding) all the messages of the people i am following to my selected device (Cellphone).