We don't know for sure which specific display you are using since you haven't provided that information so a lot of what we are providing is speculation.
It is time for you to start over again with a simple circuit and sketch that just uses one LCD. If that works OK with each LCD then change the sketch to use both LCDs
simultaneously.
I would add the other I2C device(s) on next and then the 1-wire device(s). When things stop working you should have a pretty good idea of what caused the problem.
Don