one solar panel is getting more power than another panel connected in parallel
Theoretically yes.

You do not say the voltage and current ratings but just the wattage. Solar panels are rated with respect to voltage and current. 


Connecting two solar panel in parallel with same voltage rating will sum up the amperage. If two panels have ratings of 12V, 2A. Then, the rating of parallel combination will be 12V, 4A.  So, power will be doubled.
Any panel which is under the shade can also act like a load. And hence a blocking Schottky diode is a must for both the panels.
For a practical circuit, the power would be at max very close to 48W or lesser. Having a MPPT controller can yield efficient power transfer especially when there are multiple solar panels involved with a nonuniform shading or solar exposure. (One MPPT for one solar panel is also possible)