This is a training defect which I see quite often, too. It appeared about two software versions back. The left turn lane should be ignored while the vehicle travels straight on. Most of this time, this is the behavior. However, if there is a vertical curve or horizontal curve in the vicinity of the left tun lane then vehicle follows the strong line marking -- in your case the double yellow line -- and goes incorrectly into the turn lane. Hopefully they will fix this in the next version by training with all the video snips they must be gathering via the triggers of incorrect behavior, such as your example. In the meantime be extra careful!