As a simulator executes each frame, it does so by stepping forward a small amount of time (a time-step).
The larger the time-step, the more 'coarse' the simulator results are. The more simulation departs from reality.
There is always some error in the simulation, because it is impractical to make the time-steps infinitely small.
The difference between 3.5 and 3.36 is only 4.17 percent.
See if it makes much difference when you change the time step.
Also as a secondary influence, change ohmic resistances in components.