I am not a frequent flyer. However I have flown Delta a number of times. I made a reservation for December ( so far one time change--both flights) When I made my initial booking the outgoing ( JFK-FLL) flight and the return flight had the same flight numbers. Now, with both flights leaving earlier--it is a different flight number, BUT both the incoming and outgoing are AGAIN the same number.

I've never came across something like this--is this normal? ( last Delta flight was to Vegas in Sept 2019 AND numbers were different)

Thanks in advance.