The main page of RACHEL parses the output of an ifconfig command to show the lan/wifi interface’s assigned IP addresses, so that is correct. DHCP addresses are all set in the 10.10.10.100 - 10.10.10.199 range in the dnsmasq.conf file used as part of the RACHEL install. The wifi adapter has an ip of 10.42.0.1 because it’s being set by Network Manager and because the static ip setting from our dhcpcd file is being ignored by it. The reason the network is working is anything on the network is being forwarded through the iptables rules to “anywhere”.
So the only thing to do is figure out how to override Network Manager and set the IP to 10.10.10.10 for the wifi interface. This could be editable in the ipv4 settings menu for the hotspot connection like from above. If not, you can try /etc/network/interfaces and see if the 10.42.0.1 IP is set there and change it to 10.10.10.10.
When this is all figured out you should definitely do another fresh install with an updated installer to make sure it’s all working.