NET SHORT DRC CHECK IN ALLEGRO16.6

Hi Good day !
 
I am using allegro 16.6 version
 
If I run Design Rule Net short check report  , there is no short in the design , but when I check manually all DRC I found net short DRC having spacing of 0.25mils(refer image)
 
I wonder  Y the report shown  there is no net short ? what is the minimum value its taking for net short DRC generation 0 mil ?
 
Best Regards.
Girish Kumar