Passenger speakers not fully working with AUX cable

Hi, I'm new to this forum. I have just bought an 09 Clio dynamique S 1.5 dci and have bought an AUX cable off eBay. I have followed instructions on the Internet and I have it working (partly). The speakers on the passenger side do not fully work when the AUX cable is in use, the speakers do work with radio/CD.



I have tried two different cables now and I'm at a loss, any suggestions would be gratefully appreciated. Thanks