What the difference ? primary et secondary hashrate

Hello,
can you tell me what is the difference between the primary hashrate and average primary hashrate which at home are nonexistent (see screen) and the secondary hashrate and average secondary hashrate?
and is it normal to have no primary hashrate on my rig or it comes from a bad config?
thank you for your answers !

Hello Cyril,
on Grinmint,
Primary hastrate stands for C31 (Cuckatoo31), and
Secundary Hashrate stands for C29 (Cuckaroo29).
Take Care!