Playing two items at the same time

Sometime I see a blue icon with an arrow in front of a playlist-item. If it’s there (always after a voicetrack), two items will be played at the same time. The guy who voicetracked that playlist doesn’t know what he did to get that item. You can see it in this screenshot.
What is causing this and what I do to prevent this

Padding (aka. Sweeper on Ramp)

This has been request by a lot of people - it’s now possible to place sweepers over the ramp in AUTO mode, also if the sweeper is shorter than the ramp. We call this “Paddding”, as the sweeper is padded with silence and started at the same time as the song. You can set the padding in the Mix Editor, just by dragging the sweeper to the right over some kind of virtual “notch”.