Double-NATing is a common source of problems. If 192.168.1.1 is the first router, can't you get served up IPs in the 192.168.1.x range instead of going into the 192.168.10.x? I understand that your 2nd router is technically acting only as a switch, but why can't you make your 1st router a switch too and turn off its DHCP (since there is clearly a third router involved too at 192.168.1.1)?
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