Trying to mod political parties, but the wrong ones are active at the wrong times (HPM)

I'm trying to mod the socialist parties of the US in HPM, and one part of that is changing their names. To do this, I made a new party in the proper way in the CSV file, but when I load into my ongoing US game, the socialist party has a name that isn't supposed to show up until 1876. I delineated the name/party changes properly, what am I missing? Code below

party = {
name = "USA_socialist"
start_date = 1848.1.1
end_date = 1876.1.1

ideology = socialist

social_policy = welfare_state
economic_policy = state_capitalism
trade_policy = protectionism
religious_policy = secularized
citizenship_policy = full_citizenship
war_policy = anti_military

}

party = { name = "USA_socialist_2" start_date = 1876.1.1 end_date = 2000.1.1

ideology = socialist

social_policy = welfare_state
economic_policy = state_capitalism
trade_policy = protectionism
religious_policy = secularized
citizenship_policy = full_citizenship
war_policy = pro_military

}

USA_socialist;Workingmen's Party;;;;;;;;;;;;;

USA_socialist_2;Socialist Labor Party;;;;;;;;;;;;;