Clean strips when overlapping with surface cleaner

[squidskc]

Surface cleaner issue

I have a 16" classic surface cleaner. My issue is it is causing stripes when using it. Not sure if its just the surface or cleaner. It doeant matter if I walk back and forth or side to side. It has newish nozzle on it. I replaced them last year and have only used it a few times since then. Just wondering if anyone else has had this issue and knows how to correct it. [20180530_154138]