Generating Moving Loads In Staad

Hi,

Could you please tell me why the wheel load, 524 Kn is dividing as 342.569 Kn and 181.431 Kn?

Please see the attached screenshot below.

I used,

UNIT METER KN

DEFINE MOVING LOAD

TYPE 1 LOAD 252 524 DISTANCE 4.870 WIDTH 3.93

LOAD 1 

SELF Y -1

LOAD GENERATION 5

TYPE 1 0.593 0 0 ZI 1

Thank you