ISO shows a different source sub-inventory from the IR sub-inventory

Good day

The IR was created with a source sub-inventory (i.e. XXX), imported into ISO where is shows a different source sub-inventory (i.e.YYY), when i check the transaction summary it shows the same ISO (i.e. NO: 111) created on two lines, 1. ISO 111 items from (XXX) to (YYY), then 2. ISO 111 items from YYY to expense destination location.

anyone with an idea how this could have happened,

Thanks

ST