Glitch on Traffic Alerts??

 

This only occurs on one stretch that I've found but wanted to know if anyone else has experienced it.

Using the built-in antenna for traffic alerts, when travelling WEST on Beltway 8 in Houston. I get 'slow traffic ahead' alerts for traffic going EAST (behind me). This is the only place I've ever noticed my Nuvi 760 not 'knowing' which direction I'm going.

This is after I've already turned and am going West. Like 2-3 miles behind me.