Weird brown spots in St. Augustine

Yesterday after I cut my grass three small brown rectangular spots showed. I haven’t had any browning all summer and I have been making sure to put 1-2 inches of water on it weekly, wether by Mother Nature or by Father Sprinklers. I did apply some liquid fertilizer (20-0-0) in the middle of June but I made sure to keep it watered so it wouldn’t burn up.

I’m unsure what is causing this and how to treat it any help is greatly appreciated!

Hopefully these pictures load up

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