Odd driving behaviour after wheel change

Dear community! It’s kind of strange: Since I’ve been back on my 850 summer pitches, my moose has been following every track groove, so strong that I often have to correct it. I am currently driving Dunlop Sport Response in size 205/50 VR16 on Columba. Last winter I drove Continental Wintercontact in size 185/65 TR15. I have been driving the summer Dunlops as well as the winter Contis for several years. Last summer I had a second S atz summer pellet with Hancook 205/55 VR16 on Persus. I didn’t notice anything with them either. This year I wanted to run the Columbas with Dunlop again. An acquaintance had the car on stage and could not notice a game on the crossbars. Also, the steering has no game. What can that be? I don’t imagine that? Addendum: The crossbars (of Febi) were changed in 2012