Parent row class causes children divisions

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Column C-x03 M-x06 S-x12
Column C-x03 M-x06 S-x12
Column C-x03 M-x06 S-x12
Column C-x03 M-x06 S-x12
Column C-x12
Column C-x11
Column C-x01
Column C-x10
Column C-x02
Column C-x09
Column C-x03
Column C-x08
Column C-x04
Column C-x07
Column C-x05
Column C-x06
Column C-x06
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x01
Column C-x02
Column C-x02
Column C-x02
Column C-x02
Column C-x02
Column C-x02
Column C-x03
Column C-x03
Column C-x03
Column C-x03
Column C-x04
Column C-x04
Column C-x04
Column C-x05
Column C-x02
Column C-x05
Column C-f08
Column C-f08
Column C-f08
Column C-f08
Column C-f08
Column C-f08
Column C-f08
Column C-f08
Column C-f09
Column C-f09
Column C-f09
Column C-f09
Column C-f09
Column C-f09
Column C-f09
Column C-f09
Column C-f09
Column C-f10
Column C-f10
Column C-f10
Column C-f10
Column C-f10
Column C-f10
Column C-f10
Column C-f10
Column C-f10
Column C-f10
Column C-f11
Column C-f11
Column C-f11
Column C-f11
Column C-f11
Column C-f11
Column C-f11
Column C-f11
Column C-f11
Column C-f11
Column C-f11