This can be frustrating, especially when an adjuster does not explain their reasoning. If the initial adjuster had mismeasured and included more square footage than what you submitted, then yes, the carrier would adjust the estimate accordingly, which would cause a reduction in payment.
However, if the floor measurements were higher than what had originally been included on your carrier’s estimate, then that is an entirely different story. It would not be common practice for an adjuster to reduce your estimate without an explanation as to why. Each flooring contractor will have their own debris removal cost which would typically be calculated as a ‘pick-up truck load,’ unless you have a dumpster on the property that had been included in the estimate. All tradesmen would discard their debris in that dumpster if that were the case.
If the flooring measurement you submitted was more than what the carrier had included, then I would call your adjuster and have them explain their reasoning for the deduction. If you are unable to obtain an answer, then you can always reach out to your agent’s office who should be able to assist you with your claim.