Isx 2350 , metal shavings in the fuel filter

[T680]

Ok guys,seems that there is lots of good info in this site
Got isx 2014 and this is the second oil change that I've done that show bits of shavings in the f filter when I dumped the fuel in a clean container, I could lift those bits with a magnet

This truck has the water separator((cristalcover)) don't remember the name but not the paccar standard and it has the fuel cooler that seems to me that cools the returned fuel before going back to the tanks....

So, question what is going down...pls note that I didn't see any shavings in the water separator filter , that I changed and cleaned the dirty fuel out at the same time with the engine's filter

Tnx