Hi Trev
Did you put them back together on "neutral ground" - as they can be a wee bit territorial after having had babies? If they've been in with each other before, they should settle down ok.
Mine usually have a bit of a squabble when initially put back in with the herd after weaning, but sort themselves out after a day or 2.
I have heard of folks spraying deoderant on pigs when introducing/reintroducing them - I haven't tried it personally, but it has worked for others.
Hopefully your girls will settle soon - they'll be glad of each other to snuggle up to this time of year