ExpressionBasic force
كُلُّ إِنْسَانٍ لَمْ يَقُمْEvery person failed to stand: nobody stood
لَمْ يَقُمْ كُلُّ إِنْسَانٍNot everyone stood: the standing of all is denied
In the first, the negative predication reaches each member. In the second, negation takes scope over the totality of those who stood. Thus we know only that it is not true that everyone stood.
The second construction does not logically entail that some people stood. That additional claim requires contextual evidence.