everything that was old is new again.

[txsrooster]

I have a gmail account set up on my TP. I check my email really often since I use it for work. Two time now I will look at the message count it will read 80 new messages. Now it is real uncommon for me to get 80 messages in 10 mins...but I look and it is the old messages that I have already read just now they are marked as unread.
My other email accounts on my phone do not do this...any idea what is going on.