Default [Q] Weird double sound on bluetooth headphones (BSH555)

I just bought a bluetooth headset and after connecting it with my phone, it sounds weird.. as if i hear things double.... as if the virtual room effect is turned on. When i send a message i would normaly hear "kit", but now i hear "tekit" (which is the closest i can get to explain the sound in writing)

First thing i tried was connecting it to a different device... same problem. I've tried a S4, S3, S3 mini and a Note 10.1... all have that same problem. So first thing to conclude, there is something wrong with the headphones......
But then i tried an iPhone..... it worked fine :/

So it seems to be about the basic way android sends sound to the headphones.. anything i can do?

P.S. these headphones can be connected with a jack, in case it's out of battery. If I do so, sound sounds fine.