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@42 it could be because of extra connections on one side of the aircraft.
For example, say one of the fuselage pice on the left wing has an extra connection compared to the right wing the aircraft will yaw left during taxiing and roll left during flight.
The more connection, the more serious the problem.
To solve it you will have to manually make sure everything is connected to the intended parts and not anything else or turn of mass and drag of all parts (which is not ideal).
All so, there is this bug(I think?) Which adds random unwanted connections which really worsens this problem.this usually occurs when using the "auto reconnect" option in the part connections menu. And some times parts that are nowhere near each other gets connected, which really bothers me.
I know this because I have ran into this problem multiple times.

@overlord5453 Yes, and roll.

@42 i didn't understand. You mean the tendency to yaw to left or right?

@overlord5453 I used that landing gear because it has less chance of rolling while taxiing.

You can use the wing gear instead. I think it will look better.