Because there is inner air cycling in the lights as we design. As for headlights, you can also open the cover of low/high beam so that the moisture will out more quickly. If the moisture still exist, please feel free to send us message for help, we will try our best to help you. We will appreciate if you can takes some pictures or videos about your problem, and also send us the barcode of the products(every product we sell has a barcode on the backside of the light and outside of the package, it's very important for us to find the problem) If you open a request or case optionaly before communication, it would be hard for us to serve you. (NOTE: This does not include weekend & holidays).Insufficient information will delay the order process so please read the invoice carefully during checkout. The item "LED Red Tail Lights For Honda Accord 2018 2019 2020 Rear Brake Lamps Assembly" is in sale since Monday, September 21, 2020. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Lighting & Lamps\Tail Lights". The seller is "zhize-72" and is located in Guangdong. This item can be shipped worldwide.