Wiring a box that has two switches to multiple lights
1,2, and 4 only seem to feed into the wire nuts, one of these is your power source, the other two are feeding power elsewhere.

It appears that your black wire nut is line power, your left switch controls a load on the red wire on #3 and the right switch controls a load on the black wire in #3.  This is likely split off elsewhere to the separate lights, sharing the neutral on #3.

So it appears that your switch line/load is possible reversed.

Also your smart switch likely needs a neutral to function, which doesn't appear to be connected, from the white wire nuts.