Side columns more often than not are pushed down to follow the main column

• Regression

Firefox 35.01
tikiwiki 13.1, fresh upgrade from 6.1, default theme, fixed width

my layout looks like this in the admin area, and it used to look like this always (expected behavior)
| div #col2 div#col1 div #col3 |

outside the admin area:
| div#col1
|
div #col2 div #col3

so both col2 and col3 come only after the content of col1,
and col2 is half way out of the screen

the layout primarily uses bootstrap.min.css
--- the dom-inspector says that these are the applied rules for col2 ->>>
element {
}

1. col2, #leftcolumn, #col3, #rightcolumn, .cssmenubox, .box-menustructure, .box-data ul.cssmenu_vert, .box-data ul.cssmenu_vert li ul {

overflow: visible !important;
}
.col-md-pull-8 {
right: 66.6667%;
}
.col-md-2 {
width: 16.6667%;
}
.col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8, .col-md-9, .col-md-10, .col-md-11, .col-md-12 {
float: left;
}
.col-xs-1, .col-sm-1, .col-md-1, .col-lg-1, .col-xs-2, .col-sm-2, .col-md-2, .col-lg-2, .col-xs-3, .col-sm-3, .col-md-3, .col-lg-3, .col-xs-4, .col-sm-4, .col-md-4, .col-lg-4, .col-xs-5, .col-sm-5, .col-md-5, .col-lg-5, .col-xs-6, .col-sm-6, .col-md-6, .col-lg-6, .col-xs-7, .col-sm-7, .col-md-7, .col-lg-7, .col-xs-8, .col-sm-8, .col-md-8, .col-lg-8, .col-xs-9, .col-sm-9, .col-md-9, .col-lg-9, .col-xs-10, .col-sm-10, .col-md-10, .col-lg-10, .col-xs-11, .col-sm-11, .col-md-11, .col-lg-11, .col-xs-12, .col-sm-12, .col-md-12, .col-lg-12 {
position: relative;
min-height: 1px;
padding-left: 15px;
padding-right: 15px;
}

• {

box-sizing: border-box;
}
body {
font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
font-size: 14px;
line-height: 1.42857;
color: #333;
}
html {
font-size: 62.5%;
}
html {
font-family: sans-serif;
}
<<<--- the dom-inspector says that these are the applied rules for col2 -

closing
the regression was caused by my own changes in the tiki-wiki_topline.tpl, which I integrated imperfectly

This bug has been demonstrated on show2.tiki.org

Please demonstrate your bug on show2.tiki.org

This bug has been demonstrated on show.tikiwiki.org

Please demonstrate your bug on show.tikiwiki.org