My initial reaction was in the negative, but I can think of one scenario that might lead us to this kind of request. As in almost any profession or craft, there is more than one school of conducting. In one school, the German school, the orchestra plays behind the beat. I do not conduct that way but, rather, prefer the orchestra to play with the beat. You should read nothing into this. Much great music has been made by conductors and orchestras in the German style.

If your orchestra and conductor play this way, then, you must understand something about the keyboard. That is, the keyboard will sound more quickly than other instruments. If you and your concertmaster attack your instruments at precisely the same moment, your keyboard will sound an instant sooner.

Now these are very small time increments, but a good conductor will certainly hear them and they will certainly have an effect on the ensemble and the ultimate sound.

If this is not the explanation, by the way, that is something else you must not read anything into. The field is large and the variables many.