Mine did the same and was replaced under warranty (in Australia). Make sure they reprogram / configure the ATCM otherwise you may find issues with some of the 4WD controls.
Check ours out at https://digitaltwin-developments.com/products/ford-ranger-raptor-tailgate-seal-kit
Plenty of happy customers in the USA and other parts of the world!
Interesting to see the differences in spec to our Aussie ones, the ones that the USA gets that I would have loved in mine are driver memory seat, garage door opener and 400W in-bed power