Show of Cause notice Issued after Challan was paid

Hello I'm new here, So while I was riding my scooter through the Banastarim bridge I exceeded the speed limit and was captured on the speed cam. The cops stopped me and informed me of my overspeeding (42 on a 30)(my first challan). They said that if I can't pay the challan my license would be suspended for 3 months. I paid the challan through gpay and received the receipt. I thought that was the end of the story so I misplaced the receipt(not with intent obviously). However, after two weeks I received a Show of Cause notice where I was asked to appear at the Panaji RTO, to explain why my license shouldn't be suspended (nothing about payment of challan was mentioned). I was confused as the challan was paid on the spot and even when I checked the status of the challan online it was mentioned that it was disposed. A few of my relatives and friends have also received multiple challans which were paid on the spot but they never received such a notice. I checked on Google but it says that a Show of Cause notice may be sent only in cases where the challan isn't paid. So I wanted to know if this notice being sent is a common thing or is there a possibility of an issue on their end. Please also give suggestions as to what to do or say when I am being questioned or what questions may be asked at the RTO🥲.