He did eventually pay to the correct address, so maybe this was somehow not intentional. I can't imagine how it could have happened, though.
This is my fault, system works fine.
That address 1HE3ycm... is my paying address. > i paid from 1HE3ycm -address to your 15GM6.. -address and somehow i accidentally changed/messed up the addresses when i reply to you.
I can not understand how i did it, but i'm very very sorry about this address-mess