Note 5 charger doesn't work well with Tab S

I have both the Note 5 and the Tab S 10.5. I usually keep the Note's charger in the living room and use it for either the Tab S or the Note if I need quick top off. The Tab S' charger is upstairs for overnight charging. With the Note 4's charger (my previous phone) both devices charged fine. I've noticed that since switching to the Note 5, its charger does not charge the Tab S very well. With screen on it actually looses % rather than gains it and with the screen off charging is extremely slow. Using it's own charger the Tab S charges at its normal rate. The Note 5 also quick charges fine on its own charger.

Just an odd thing I thought I would mention. Has anyone else tried using the Note 5's charger on a different device?