If your using Bitcoins then you need to always check your Bitcoin wallet address that you want payments sent too. I have multiple addresses but I have found out today that when I copy and paste my addresses it is actually pasting someone elses address into the fields as the computer was infected with malware and was recognising all addresses similar to bitcoin and changing it to the spammers.
Make sure you have the best malware and antivirus program that you can get on your system and make sure you don't lose any BITCOINS that are rightfully yours. Hope this helps
