RE: Render Queue Messing Up Frame Order in 5.1

I’m facing an issue in 5.1 where the rendered image sequence numbers are completely out of whack. The frames are not rendered according to the order of the shots in sequencer, and so the final output has shots that cut randomly to other unrelated shots, etc. What could be the cause of this? Is there a requirement to name shots in a specific was so as to get the output frames in the right order?

P.S - this is not an issue I faced when using the Render Movie feature in UE4