Ltspice Transformer Simulation
I am getting different current in winding(why?)


The primary current contains the load current AND the magnetization current. The secondary current is only the load current.

Magnetization current is due to the voltage supply being attached to an inductor (with secondary open circuit).

You'll need to be clearer about what DC offset you are seeing but i suspect it doesn't really exist after the first few cycles of AC have passed.