Cannot search by IP address arrange

I tried to use IP address range to search computer , but return error Duplicate search results were found. They were not added to the result list.

Does this mean this function is not working properly?

1. What duplicate record does it mean ? Same IP with more than one BIOS name record?

2. As my understanding, even there is duplicated record, SEPM should list out others without duplicated record list.

Thanks