Vertices pop out after painting skin weights

i have finished painting the skin weights on my model and have made sure all the skin is 100% influenced by a corresponding bone.

The problem is when i move lets the ankle joint, some vectices on the buttocks pop out. I checked which bone influences the buttocks area and it was the hip bones, and it has a 100% influence e.g. white paint weight.

please help me, or i will commit suicide, thank you

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