Audio for Astro a40's is backwards?

Hey guys just wondering if someone could assist me in this predicament, so i bought the xbox one version of the a40s to obviously use on the xbone but after selling it i had this headset lying around so i bought a cheap headphone splitter (1 female - 2 male connector splitter) and i cant recall if this was a problem at first but the audio is back to front (left is right and right is left) wondering if there is a fix for this or am i retarded and missing something? Cheers guys.