Suits bend the rules

A card of the route's suit can go either way.

Your left route is going up, but its last card is a diamond. A card of the route's current suit may be played whichever way it goes. The direction then follows the last two cards.

Play the 5 of diamonds on your left route, even though it is lower.

The route took the lower card because it matched the suit. Look at the arrow: the route is now going down.

Learn to play | Up or down | Kings double