The Sales figures that you see in RestockPro should be similar to what you see on Seller Central though they likely won't match exactly for a variety of reasons. The good news is it won't affect your demand forecast in any significant way.
The most important thing you can do to ensure the demand used by RestockPro is the best it can be is to be sure that your Restock Rules are up to date for your Store and for any Suppliers where different settings make sense. Be sure the Velocity Estimation Rule makes sense for the product. For most customers, we recommend setting the "Adjust Velocity for Out of Stock" to YES and turn ON the "Include Pending Orders in Sales Calculations" checkbox:
Why don't they match exactly?
Amazon does not offer any type of real-time data API access, so tools like RestockPro synchronize periodically throughout the day. RestockPro computes the 2-day, 7-day, etc. sales figures from your raw orders data, and depending on what you are comparing to on Seller Central, we might not be using the exact same start/end date time cutoff.
Why won't this negatively affect the forecast?
RestockPro uses the sales to calculate your future demand. If the sales are off by a small number of units, the demand may be different by a small fraction, which doesn't add up to a significant difference in what RestockPro will suggest that you order.
The RestockPro sales figures and Amazon figures should be similar. If they seem off by a lot, just let us know and we'll double check for an issue.