These breakers are Cutler Hammer breakers with tan handles but are not labeled “Eaton”. Are they the type rated for two conductors?
I don’t believe they are rated for (2) two conductors. At least the “CH” brand from Eaton I am aware of are not. Chances are those are breakers in the 15A-25A range that are not typically rated for (2) two conductors.
Most of the Eaton “CH” brand have a single opening for the termination and in a “V” insert pattern which is the one listed for (2) two conductors.
Hope this was helpful…what is the amperage on the breaker as I can’t tell.