Strange Network issue in 1809

I have 4 PC's in my private network & I cant see them including the PC i am on in windows explorer under network but I can access them by making a shortcut by entering \\name of PC & can see it that way.
Why is 1809 hiding this? I have my network discovery set to be visible also on all my windows 10 1809 machines. I turned off the firewall in router also but that did not do anything. Its mind boggling is there another setting to show them in windows explorer? This goes for all mt 4 PC's one on WiFi I can see name of that pc on that machine but not others. Other 3 are hard wired & only 1 of them I can see all the networks not the other 2 but settings are the same & all on win 10 pro. I noticed this recently I use to be able to see all machines on all PC's & changed nothing.

Have all pcs got netbios running its that which show them up on the network if you do ipconfig /all normally the last entry is netbios. Windows doesnt look for pcs it asks the master browser for a list run this util on all pcs does it see them and note which is master broswer NetBScanner - NetBIOS scanner

so what u saying this is normal netbios is enabled using ipconfig /all

Ipconfig only tells you if NetBIOS is active

ok this is what checked in all my machines

ok do i need the SMBv1 for my windows 7 machines & Linux when I connect them

Did you run test from post 2 so we know master browser and if pc can be seen it also often kicks it back into life