did you both start them manually?
could be cause of the starting method they are pulling unevenly that should sort itself out after a few to several months
for instance if you backcombed or tnr (i would guess more likely from backcomb) and as your pushing the knots towards the scalp a few hairs are being held from being pushed down so are holding a disproportionate amount of weight (like the circus people that hang from their hair need to be certain that every hairs taking the same amount of force the whole head then can support the weight of 3 elephants but if 1 sections slightly looser or tighter, disaster can strike and a chunk of scalp get ripped out)
as they grow and knot they should even out as those weight bearing hairs will have other hairs knot around them till the pressure evens and they can start to knot around others
i can't see this being much of a long term issue but likely will take months possibly till they have grown a lil after the roots dread and mature