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First, do you have Synthetic Fulls enabled in your schedule? If so, I can explain why your Full might be growing each time a consolidation operation occurs when an Incremental runs.
If you're just comparing the initial sizes of brand new Full backups, then check the job logs of your various Full jobs. You'll see details of each partition included in the job listed under "Operation X of Y", and each of those entries will have a "Used" line item showing how much storage is consumed on that partition. See which partition(s) are growing with each job. If you see growth there and you're not sure why, then that's out of scope for Reflect because it just captures images of the partition(s) that you tell it to; you'd have to use some other tool to figure out what files/folders are growing on the partition. If you're not seeing any meaningful growth there over time, then check the "New File" line item toward the bottom of each job log. If that's growing even though the amount of source data isn't changing, then that would indicate that even though the total amount of data on the partitions isn't fluctuating much, the nature of the data may be changing such that it is less compressible, in which case the resulting Full file will be larger.