css - vanilla bootstrap: 12 columns go beyond the screen -

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with vanilla bootstrap, run issue 12 columns go beyond full width, end having 1 fewer column. have solved issue time time without understanding why ran issue. know why happens?

enter image description here

if using container-fluid, need use row-fluid too, see if works , stops columns misbehaving. plus have twon containers 1 should fine multiple rows.


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