Is possible to get overshoot on bessel filter?
It's not exactly clear what you mean by overshoot. Let's define it as "when filtering a square wave, the max of of the the output should not exceed the steady state of max of the square wave".

In this case your statement "as i know bessel filter shouldnt have overshoot" is wrong. A bessel filter will indeed overshoot. A few first order filters will not overshoot (butterworth, chebychev, ...) but any filter of order > 1 will overshoot.