Kickr Bike Help

Hi. Just upgraded from a Kickr to a Kickr Bike and ridden my first race on it with our cycling club. Before I upgraded I was usually 2/3rd all the time and happy sitting in the front of our TTT.

We were all in the same bikes on Zwift (MTB) and pushing 3.5w/kg with others pushing between 2.5 - 3.

The issue is that I could not keep up with them at all and was being dropped. Up hill I was pushing 5 and someone overtook me pushing 3.5.

Is this the kickr bike or am I missing something?

Even in tonight’s race I came last and worked my butt off. Not complaining I’m last, but everyone else has said that I can not drop that much with a new setup.

Any help would be great. Thanks.