Knots in netting easily undone

My husband spent a little more money on this net than some other choices. But we were disappointed by the quality. It didn’t seem more heavy-weighted netting and the knots nearest to the rim came undone (the net was not installed and I think one of my kids grabbed it but the knots slip out easily) and so we had to re-tied knots). Clearly that is not easily done. We couldn’t figure out the type of knot they used in the first place.

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