Abrupt color change in exported jpg

If anyone can provide some help and/or insight on this, I would be grateful.

Please take a look at the attached file. Note the swath of bright red in the upper part of the image, bordered on the top and bottom by darker swaths. I'm trying to do some lighting effects here and the red light is supposed to transition smoothly, without the lines of abrupt color change. The map looks great in CC3, but when I export a selection of the image as a jpg (regardless of quality percentage), I get these abrupt lines of color change.

Is there anything I can do about this?

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