This has been a thing for years on my China bikes. The grommets that hold the side plastics don't last long. Without them the plastics rattle a bit loose. Well I finally got around to 3d printing some new ones out of a flexible plastic that is working out quite well. I'll try an upload a pic here. If not, I have them shown on my web site for sale if you need some.
https://radpaul.weebly.com/brozz-and-hawk-250.html