lopsided gammes happen because of the following things
Gunnery: you or your opponant has some better marksmen.
RNG: Detonations and Cits pens vs overpens. will RNG favor your volley or will you miss all 9 shots.... time will tell.
Momentum: Morale and momentum play a very strong roll in player thinking and actions, playing when moreale is high usually will result in more precise actions and swifter responses. Momentum, killing one or 2 ships in a short time without a loss on your side means you have a distinct firepower advantage, with the number of people usualy split off to cap a point. Losing one cap force will give a distinct advantage to the killing team and allow them to manuver more freely.
Manuvers: where you are and where you and your team can focus firepower, everyone [edited] and whines about how BB's camp in the back, CL are always hugging island waifu, and DD's are suicidal and need more HP or armor. but a team that has a superior position and can bring more firepower onto a target in a shorter amount of time will have the advantage.
Focused fire: This is the big one, a team that picks a target, and smashes it before selecting another will ALMOST ALWAYS have a massive advantage due to the systematic removal of a target. Versus everyone spreading fire out among all 7 or 12 red ships.
just some food for thaught