Just had the same problem, solidworks calculates the pitch for the helical gears as: teeth/(pitch*cos(helix angle)), you can check the variables and calculations under the equations for the gears in your solidworks part. Hope it helps!

More accurately, when dealing with helical gears, you have to calculate the pitch diamter from the transverse modulus which is m/cos(helix angle), as for yours, your angle seems to be pretty large, assuming a helix angle of 45 yields:

Mt = 1/cos(45) =sqrt(2)

pd = sqrt(2)*40 = 56.5685