If you are on cPanel and they recently upgraded to 11 that could be the culprit. When we upgraded some boxes were fine but for example one added a full backup cron at 9am (in addition to the original in the "wee hours") Nobody ever figured out why some crons moved around by an hour one way or another and why on this one box another one just appeared out of thin air but we had some straightening out to do.
If you are on a cPanel box that could possibly be the culprit.
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