Hello, I do not have enough experience working with fabricators for production projects, I had a gerber files of single board and sent it to fabricator to order a of boards placed into panel 2x5 array with rails, fiducials, etc.
I have received a gerber files of the panel to approve before production and I noticed that all copper sizes were increased, for example traces that were 7mil are now 10mil, via pads that were 19mil are now 22mil, many circular via pads were swelled to the point that there is only little clearance between them, I am just not sure if this is normal practice, for example, see attached illustraton of row of pads on one of ICs, one picture is the original gerber as it comes out from PCB design software and then another picture is how it came back to approve. I am just trying to undersand if this is normal thing to do by fabricators.