The Sales tabs are delineated according to payment gateway. Thus, on this form, it will be that you have multiple payment gateway feeds configured. This way of reporting sales data per payment gateway was also in place prior to v2.7.
That might explain it. We’re using both PayPal and Stripe. However, since each submenu does not provide a “header” distinguishing both payment gateways, perhaps you guys can add this to your code and/or simply use one Sales submenu with an update to your table showing a new column titled, “Payment Gateway” (or similar).