The antenna pattern ID for this transmitter is listed as number 7858, and it looks like that antenna pattern entry is incomplete. Most antenna patterns specify the relative power output in all directions (360 one-degree increments), but the data for antenna pattern 7858 only covers angles between 0 degrees and 89 degrees.
It looks like someone accidentally copied the vertical beam pattern data and put it where the azimuthal radiation pattern ought to be.
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