KSP not recognizing motorized wheels on base

[maddog59]

I have a contract for a base on Gilly and it requires that the base be on motorized wheels. So I built the base, and regardless of whether I take it out to the launch pad or the runway (to check to make sure I've met all of the requirements of the contract), the program won't recognize that there are motorized wheels on the base. The beast even starts rolling around. I've tried all three versions of the motorized wheels. There's batteries and solar panels galore to provide power.  What am I missing???