Inconsistency Between Web and Native App Export Structures

I’m running into an issue with data exports. When exporting through the web, the structure differs from what I see in the native app it isn’t organized the same way. Is there a reason for this discrepancy? Ideally, I’d like the web export to follow the same structure as the native app. I’ve created a sample to illustrate the difference and would appreciate any guidance or insights on this.

CATIA V6   WEBAPP 
Top Node1 Top Node1
 Part A  Part A
 Part B  Part C
 Part C  Part B