Hi David,
If the incremental refresh started at 7:45 PM UTC on Oct 23 with a lookback window of 1 day, does it mean the anchor point was Oct 22 at 0:00 AM UTC or Oct 22 at 7:45 PM UTC?
In one of the questions I had covered incremental refresh : Scheduled incremental refresh of dataset is not working - #3 by Koushik_Muthanna
When you would have setup an incremental refresh, initially there would be a full refresh. The incremental refresh anchor point would then be ( Oct 23rd 7:45 PM -1 day (24 hours) = Oct 22nd 7:45 PM )