AnalyticsPlus report is missing data that the SD+ Report module is not

AnalyticsPlus report is missing data that the SD+ Report module is not

I have been running reports against Change Management - Change records. Over the last couple of weeks I've noticed that the Analytics report was actually missing some change records, even though we are well over the sync time between data input & report running (sometimes by days - not just hours).
I've run a similar report from the SD+ Report module (as close as I get with filters etc) & the SD+ report brings back all the changes expected. I've then completed an excel lookup against the 2 reports & I'm missing 6 records.

Any suggestions as to why these are missing? Thank you.

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