If you are reducing the engine revolutions the oil pressure will drop. Usually before or during a clutch disengagement and engagement you let up on the fuel pedal.
When you re engage the clutch the revs come back up. Less than when you changed up from the lower gear but still upward from the engine trying to find idle. You are once again adding fuel.
Now when youy transfer your foot from the fuel pedal to the brake pedal revs are certainly going to start to drop. Effectivly if you push in the clutch then the engine is going to idle speed. Two bar is quite normal and indicates the engine is still in good shape oil pressure wise.
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