Repro Steps :
Repro the issue In my CRM Test Org
Sales -> opportunity- > open any record -> Sub grid on form called partner account-> records available in that

Extract a list of opportunities with the data selected from the sub grid.
Advanced find -> Query to find the List of opportunity which contains Sub grid value partner account

Name-> Opportunity
View -> My opportunity view

Name : Partner Account -> value : contains data
above query will fetch the list of opportunities which contains data

but in the result view you can able to view all the opportunities but as well as we expect the Sun grid data as well