the problems yoy descrbe seem to be two things. Javs shooting the outer base wall when your inside will deal damage. In the settings the range over which the explosion is felt is defined. You are peobably withing this range and therefore take damage. Rep and die is a problem caused by lag. people see slightly diffrent things because the position info for everyone else is a little delayed but their own isnt. Data isnt instant on the internet as many people may think