PTR header disapear when should display "Release to refresh"

[ghost]

First I would like to thank you guys for this great widget. just import it and it work great (mostly - except of this issue).
The issue I have is that sometimes, I still can't tell why, when I pull down, on the stage where it turns from "pull down to refresh" to "release to refresh" the PTR header just jumps back up and disappear. if I pull down enough then the "refreshing" stage does display OK, it's just happen with the "release to.." stage.
The issue doesn't happen all the time, sometimes it works fine but when it starts the only why to dismiss this issue is to start the activity again.
Please advice. Thanks!