System property show ASUS instead of Dell !!

Hello,

I bought an xps 15 9560 ( used one ) , and i am surprised that checking system property its showing ASUS instead of DELL . But when check dxdiag command output it show the right manufacturer DELL and the right model XPS 9560 , also when i connect to dell support website and try "Detect product" option it shows the right model with the right service Tag and Express service code .

Also after the first update i did for windows , now windows showing that it will expire end of Month.

Kindly have a look at the belox screen shot.

your help is appreciated

Thanks in advance