We had the same problem in house#1. House was 2 months old. Warranty Dept had carpet installers come to fix. When they pulled up carpet, the concrete had spots that looked like something had been spilled on it.
No idea what it was, we thought mold, but installers said no. Once they cleaned it never came back
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Do not worry about things you can not change 
Last edited by asianthree; 02-23-2019 at 02:23 PM.
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