humping

[PiggieMamma123]

during an introduction, my female is humping my other female. should I separate them? please help

 

[PiggieMamma123]

the one being humped is squealing loudly.

 

[PiggieMamma123]

I'm afraid the one humping is a male

 

[Wiebke]

during an introduction, my female is humping my other female. should I separate them? please help

No, it is just dominance behaviour.
Please take the time to read these two guides here. they take you through what behaviours to expect.
Bonding: Illustrated Dominance Behaviours And Dynamics
Sow Behaviour

However, we strongly recommend to double check the gender of your piggies upon arrival and before any bonding. Mis-sexing is sadly not at all uncommon.
Sexing Guide

 

[PiggieMamma123]

I believe I mis-sexed my new guinea pig. we adopted the new pig from a pet store where someone dumped the pig and left.

 

[Wiebke]

I believe I mis-sexed my new guinea pig. we adopted the new pig from a pet store where someone dumped the pig and left.

Can you please post a clear picture of the genitalia?