Cart Tracks

We've had some visible tracks in newly emerging crops before when we've mudded in the crop or had to pre work the ground ahead of the drill. But this year everything was in good shape and quite dry and we have very noticeably delayed emergence in the cart tracks, but what puzzles us is that it only seems to be on one side of the cart. All the fields no matter what kind of stubble or seedbed have 1 row that went under the right wheels of the cart coming quite a few days later. Not just a day or 2 like the tracks often do, but almost a week later. Conditions were dry with just a bit of moisture 1-1.5in down and we got a slow 1.5in rain a week after seeding, hoses/openers were fine, drill was levelled, shanks in the tracks have the correct shims, checked cart tires and pressures were all pretty equal. Any ideas on what might have caused this? It's a Concord drill with 3.5in low disturbance BTT openers and a 2300 tbh cart. Lots of crops in the area have some tracking even behind our planter we had some, but we're stumped as to why there would be such bad tracking from one side of the cart and almost none on the other.