I need help. I mowed six yards with a walker walk behind that we bought two weeks in a row I went back to mow thurs. and this is what it looked like. the tow times I mowed it was tin the afternoon, so no frost,it wasnt wet the grass looked pretty good. Chemlawn sprayed in late march early april fert. and broad leaf killer. A landscaper sprayed grass killer on a bank three weeks before I mowed. So what the **** happend here?