Not a RWGPS user but the last time I looked it gave options when downloading, which format (Track or Route), and without any clear indication as to which would be preferred.
Obviously if you've uploaded a Track and someone downloads it as a Route, it's not gonna work. Call it user error, though the problem sometimes arises because of indiscriminate use of the word 'route' (eg "go to RWGPS to download the route for this event" - not suggesting that's what happened here of course!)