Did you check "scheduled" on the custom report you created? Only if you did so you will be able to see it in the calendar, and only for the days while "scheduled" was enabled your reports will be browsable.
If that is not the case, please share a screenshot or explain it a bit better, I am not sure I understand your question fully 🙂
I believe this is letting you know those are the oldest available logs. As the logging rolls over for available space the data is no longer available for reporting.
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