Welcome to the Forum.
It's great to have you here.
Guinea pigs can take a while to settle in a new environment, and changing things around for them can make this even harder.
You might find some of our guides helpful.
New Owners' Most Helpful How-To Guides and Information
In particular this thread might help:
How Do I Settle Shy New Guinea Pigs?
What I would say is that right now it isn't advisable to be bringing outdoor piggies inside, and then putting them back out again - the temperature variation is really stressful for them.
I would also add from my own experience that outdoor life, noises and smells, are very different to the indoor environment.
Constantly switching them from one to the other doesn't make it easy for them to settle and adapt.
It might be wise (at least in the short term) to put them in one place and allow them to settle and get used to you there.
Hand feeding, gently chatting to them, and spending time around them on a daily basis will help them get used to you.
Keeping their cage set up the same and making them feel secure in one place is key.
It would help us if you could give more details about their current set ups - are they outdoors in a shed or hutch?
When they come inside what is the living situation like (lots of people, are they in a main living area, is the cage size similar, etc).
You sound like a very caring owner, and I am sure your new piggies will settle down soon.