Hello, LM-Guys! Thanks for responce! You have a keen ear. Really subjective - there is a shift to the right channel. But according to the signal strength indicator - it turns out approximately the same. The reason for this is that the indicator strongly reacts to the cello, the power of which is concentrated in the infra-bass, colored by the equalizer, but this cello is not particularly distinguishable by ear, but the instruments shifted to the right in the panorama - violin, bassoon - are in the range of tenor, alto and soprano, which perceived by ear more clearly than the infra-bass in the left channel. When mixing, I was guided by the indicator readings, aligned the channels according to it, and such a formal approach led me to an error. Maybe next week, if I have free time, I'll do a remix with a different panning option.
Have good walk on weekend!