Mislav's dashboard

I've invited a friend to twitter, who hooked up her phone. I've been sending her direct messages from web interface and it works great; gets delivered to her phone in a matter of seconds. We are in Croatia, Europe; the mobile provider is Tele2.

But now she tried to reply to one of the direct messages. She wrote "d Mislav hi ...", where "..." was the rest of her message. Obviously she thought that she must write "hi". Also, my username is "mislav", not "Mislav" (maybe this is relevant).

The problem: I received that message only *4 days after*. To make things weirder, it didn't come in the form of direct message, but appeared in my friends' timeline. It seems the direct message was posted to her public timeline.

She's using TwitterSync for Facebook. I've never had problems with that app, it justs reposts public tweets to Facebook status.