Issue with Import User Defined Attributes Concurrent Program

Hello Experts

I am using 'Import User Defined Attributes' Standard Concurrent Program to import the Order Header Extensions.
While I try to import the header extensions, I am facing one issue which is as follows:

In the OE_HEADER_EXT_IFACE_ALL, I have the same data for the multiple orders against the same customer.

When I run the import program, it finishes successfully and imports header extensions only for the last order in the list and I don't see extensions data in base table (OE_ORDER_HEADERS_ALL_EXT_B) for the other orders.

The main issue here is that I don't even see the data in the interface table also for the other orders that I can re-import them. Not sure what is the issue happening?