but make sure to check the fingerprint after you import the key
(I recommend to check against Memo link, because faking a post on my profile is gonna be hard for someone :)
You said you sent your tokens too a SL wallet and they went to a different address, either you are compromised or your computer is. Either way it is your fault.
Another option is that there is/was a Memo issue with interpreting that specific address format. I'll wait what @memo or anyone else who tries to reproduce says about the issue.
It used to be very hard to apologize, I would just delete the messages I felt bad about. Or I wouldn't remember them at all because I was so drunk, until I would get a notification...