It looks like the SREC program ended and was replaced with smart program which in an up-front incentive. You probably got in pre 2018 before they switched over. The upfront incentive is better in my opinion as you get the cash all up front. What did you pay for your system? Did you get anything upfront or just SRECs?
The SMART Program officially launched on November 26, 2018, marking the last day solar Generation Units in Massachusetts were able to qualify for the SREC II Program.
https://www.mass.gov/guides/solar-carve-out-and-solar-carve-out-ii-program-information