I'm not sure what to caption this question but there is a weird artifact that shows up on some frames in my image sequence render. I have a 24 fps config but the animation was too fast so instead of redoing all of the keyframes i decided to do a time remapping of old 100 to new 145. I also use motion blur shutter 0.50 to add some realism. It looks like it has something to do with the plate number/text "McKenzie" object containing an emission shader parented to an empty cube which is also the parent of the car object. And the middle red line-type light below the text and the 2 red back-lights are also emission shaders but part of the car mesh. Any idea what might be the problem or is this normal?
PS: since i found a way to scale the keyframes, i tried again without doing time remapping and still get the same artifacts. I'm using Eevee renderer because Cycles doesn't render clean. I have an old GTX Titan video card.