Overlapping Named Selection error though every named selection differs from each othe
 

Hi,

I am working on 3D heat exchanger flow fluid analysis.

on photo below I have uploaded is relevant to overlapping name selection that I have never made same named selection in same geometry face/edge/vertex

How could it possibly to happen even if I could not give any same named selection?

Moreover all tubes have been picked up together and all tubes is intersection to outer region that I make design

Thanks in Advance

https://imageshack.com/i/paX0frrbp