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Not an electrician but have fooled around with these. I think you have a 3-way setup, not 4-way. There are several ways these can be wired (google images may help you), but basically the two switches control one light circuit. Thus, to have each switch control only one light, I think you have to split the circuit - rewire it - so both lights have a power source which is switched.
You could re-do the wiring in the switches so each has a supply which is unswitched (they are now independent). In the switch box that has power from the breaker, join the wires (clip off the red), then pig tail white and black to the new two-pole switch in that box. Also the bare ground of course. In the other switch box, again the switch gets changed out and the two-pole is wired with the white, black and ground. Now you have independently fed the two switches, so they can control different things. They’re on the same circuit (breaker), but operate independently. Check local code to be sure there is no issue in your area.
The problem, which you need to address before doing the above, is that only one of the switches has wire running to the light circuit. You can go to the box for the first wire, and there disconnect the wire that runs to the second light. But to operate that second light you need to run a new wire from it to the second switch. It is that last step that could be difficult, depending on access to the walls, etc.
It probably isn’t worth the effort/cost to split them, but it is possible.
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