We are Getting different numbers than the shopify app in the API, did anyone else has such a problem ?
The Shopify Admin API cannot provide all orders in a single API call, there’s a rate limit for data. Depending on the complexity of your query, you might be limited to say 100 orders.
If you need to retrieve all orders within a timeframe, or just in general, then instead use the Bulk Operations API which is built for pulling data in bulk.