if it isn’t the front derailleur then it might need a micro adjustment. The fact that it gets worse with each outboard gear change suggests it isn’t properly aligned. There might be a very slight different between the cluster alignment on the Kickr and the normal wheel set… I’ve got Sram AXS on my Kickr and don’t have this issue. Assuming the thru-axle kit is properly installed on the Kickr as well…