Interval Playlist start time

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Hi, Im just wondering if anybody knows at what point the Interval playlists begin playing.
I have a 30 minute interval playlist to play a song every half hour, my General Rotation is a single 10 second file of silence.

We are attempting to have a file play every half an hour, on the hour with the rest of the stream is silent.

I have attempted to restart the stream and AutoDJ on the hour but the interval playlists are consistently starting at 9:07, 9:37, 10:07 and so on.

Is there a setting somewhere that can be changed?
Any help is greatly appreciated.