current measuring in the pspice
There's nothing wrong. Two-pin elements have a defined direction for the current: it enters in the first pin and exits through the second. All the other elements (more than 2 pins) are considered to have the currents going in. Probing for current is done in the same manner: it is considered that the current is going in the pin. In addition, there is a convention for the solver: for all the schematic, the current through the meshes is going from top left, to bottom right.

This is what you see there: current enters in pin 1 and exits through pin 2. The mesh current is going from top left, downwards into the source, and right into the inductor (then downwards through the resistor). Since you are probing at the input of the pin, the probe considers the current going in, but the current is coming out of that pin, as directed by the mesh convention. So, you have a negative sign.