Found the error. No bug, the interupt was triggering due to the stack size difference of rocket fuel and solid fuel. So after the stop was cleared the interupt was adding it back in since 20*3=60 < 80

What did you do?

Setup posted in the following images. I had setup a train refuelling system with solid fuel earlier. Since I now produce rocket fuel I thought of swapping the solid fuel of my trains with rocket fuel using the refuelling system. To do that I placed inserter with solid fuel ...