Facebook Graph API Ad Insights doesn't match Business Manager values

_x000D_ _x000D_ I'm working on a report building tool that pulls data from Facebook Graph Api to display metrics on ads in an ad account. When I pull all the Insights from the account level the pixels purchases value is significant less than what is displayed in the Facebook Business Manager. The query: {act_id}/insights?fields=spend,action_values,website_purchase_roas&date_preset=this_month Which returns the following data: "spend": "5037.47", "action_values": [ { "action_type": "offsite_conversion.custom", "value": "16049.98" } ], "website_purchase_roas": [ { "action_type": "offsite_conversion.fb_pixel_purchase", "value": "3.186119" } ] But the Business manager displays the Pixel Purchase value to be $17,315.53 and the Website roas to be 3.44. The Spend value seems to update in real time, sometimes even faster than the Business Manager page updates. Is there some other value fields in the Insights edge that displays more purchases or is this a bug in Facebook's api?