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There aren’t any collisions.
Disable the router components on router2. If it has an AP or bridge mode do that. If it doesn’t, just turn off dhcp. The “wan” interface should be unplugged. Also change its management ip to something other than router 1’s.
It’s now effectively a layer 2 switch with an access point.
Did you setup router 2 as Access Point mode and plug the cable from router 1 to LAN port, not WAN port router 2?
Router 2 should be a switch unless you need the extra stuff for something. At a minimum it should be in AP mode. Otherwise it's very unlikely you're getting "collisions", it's just humming along like networks do
I think it's in AP mode. I don't belive switch mode is an option... And the network, as a whole, is not humming along, unfortunately. But it does sound like, thanks to yoh and everyone else, I have a few other things to address.
This. If you're not trying to use the wifi on the 2nd router, and it's already wired to the 1st one, just replace it with a switch with the needed number of ports. Having a second router can definitely cause problems if the routing functions are still active.
You can tell by the IP address range if they're on the same network, normally. If device behind router B can successfully ping device on router A then you're on the same