Delivered to wrong address (sender's address)

I am having an issue with my delivery, I posted to the recipient on Monday but the postman sent the mail to my address which I am confusing now. Has anyone that experience? The tracking number shows it delivered by my address,

Please help me to figure out.

Has any red sticker been placed on the item?

No, there was nothing, it was totally postman's mistake...

Possibly the postie delivered it because of the rts on it, you must of put your return address on I guess?
I'ts not uncommon to happen.