It's not only today. Throughout the whole grasscourt season the speed guns have been all over the place.
In Halle during the Federer-Nieminen match Roger had a serve at 223kmph and Jarkko hit his fastest ever at 218kmph which is nonsense.
Over in Queens during the Murray-Navarro match I remember Rusedski and Petchey laughing at the crazy numbers the speed gun was showing.
I thought the problem would go away by Wimbledon but some ridiculous serve speeds have been recorded today. Berdych supposedly had a 152mph serve