Well that’s ugly as f***! 
Remind me - did we discuss drying? PETG is terribly prone soaking up moisture quickly. Some will be bad in just a few hours of exposure to humid conditions. Can’t tell you how many times I’ve seen weird things be solved by proper drying.
That almost looks like over extrusion too.
Did you do really accurate bed level?
Sorry if I’m repeating, had a long night …