STAAD Wind Load Generator

Regarding wind load generator in STAAD Pro V 22.06.00.138

My structure is simply a box structure but when using wind load generator applied to a group,

the wind load generated in +X and -X as well as +Z and -Z have a discrepancy.

It seems that loads are applied properly in all panels, however, there is a mismatch in the resulting total reaction.

By further scrutinity, I found the anomaly to be in the following highlighted members.

When these elements are merged into 1 member, ignoring intermediate nodes, the discrepancy is resolved. 

I will also upload my staad model, for your reference,

the wind load cases are 30~41

I appreciate your help, thank you very much.

Application by range was also attempted and the results still have discrepancy.

 5074.Staad Model Sample 1.STD

PS. I cannot delete intermediate nodes as in the actual model, secondary/teritary beams are present in the structure.

To simplify, those members are deleted in the sample model.