I have tons of advice but I need to know what software you used.
Here's a tiny piece of advice, look at it in xray mode - first make sure you are in "preview" mode (at the top center) and then on the upper left switch from "layer view" to "xray view". If you see any red colors then that is the problem. Shades of blue and white are good.
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gr5 2,224
This is common with certain cad software. Did you use sketchup? What cad software did you use?
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