I only have 3 mods the MacDon pack and your shed and the placeable design kit. the first image is of me trying to place it but I have no color options, the second is showing I have the mod by ThundR selected
do you have both the most up to date mods, I have no issues coloring my shop, I even tried it last night incase the update broke it and it’s just fine, so something is going on with your mods. Make sure both mods are up to the current version and make sure you don’t have an old design kit in your mods folder as that will conflict with the newer versions.