Issue with Private Messages

Hi, I'm having an issue sending private messages, for some reason they are not going to the persons I choose to send it. Today I noticed that I sent private messages to several different users and one that I did not send any messages got all of them, even when they were not for him.

Let's say that I had already started a conversation with user A before and it shows on my conversations list. If I try to send a new message to user A by clicking on "New message" and searching for user A in the "Writing to" bar then typing my message, the message will actually be sent to the user that I had last messaged, not to user A.

Now, everything works fine if I'm in the conversations window and I look the previously started conversation with user A and just answer there directly.

I hope I made myself clear.

Thanks.