Yes that is what my 2 are like!

It sounds like one is trying to over throw the other for top piggy spot. Has anything changed recently in the house?

i'v had many guinea pigs over the years had to separate my males although would put them in the run together when i could watch them if they started to fight at about a year, do you have females as well ?cause sometimes if they can smell them they will fight hope you have more luck than i ,as it was a few years ago i kept them with rabbits( so they had company )but thy advise not to now

i had two females who used to squabble a lot. it was a lot of noise and movement but thankfully no injures... it was just lacey was a big bully and bossing cagney around. if it had gotten any worse, i would have just seperated them but where they could still see each other and be close. they were extremely close though, so it never did come to that.