The first two lines of brim are probably the best 1st layer I've ever put down. On the third line it all goes out the window. It's not like the brim is over, just checked Cura and brim line count is set to 20.
And it's the whole way around the 300mm build plate. So it's not a level issue. Have y'all ever seen anything like that before? Wonder if that's part of why my prints keep failing.