When we are on a path of two parallel lanes in the same direction, and you being on the track 01 the Waze commands you to go to the track 02, if you stay on track 01 the Waze understands that you went to the track 2 (perhaps by proximity of two lanes).

The problem here is that the Waze calculates the speed of the track 02 taking your car as reference, however it is on the track 01. Thus the track 01 would be the best option, but for this error that indicates that you (and others that did the same process described) go to the track 02, ends getting you stuck in traffic.

My suggestion is that when the Waze suggest a change of track, that has a button allowing you to cancel the exchange. This way you can continue on the track and Waze may recalculate based on yours correct position.