Weird superscore

For my October test, I got 790M and 680 for R&W,

On the other hand, I got 640M (yeah) and 700 for R&W in December

as yall can see my math score dropped a lot so should I submit my 1490 superscore or only submit my October test? (incase they see my previous math score as invalid or something?)

Planning to apply to T20's and a few ivy leagues as an international student

sorry for the silly question