TYPO3 Core

There are 16 images on a content element (text w/image), 3 columns, "no rows" checked.

I'm getting the following html produced:
<div class="csc-textpic-imagewrap" style="width: 470px;">
<div class="csc-textpic-imagecolumn" style="width: 175px;">...</div>
<div class="csc-textpic-imagecolumn" style="width: 185px;">...</div>
<div class="csc-textpic-imagecolumn" style="width: 185px;">...</div>

But 175+185+185 = 545 (!= 470)

On some other page with same type C.E. but other images (same site, same parent id), I'm correctly getting:

<div class="csc-textpic-imagewrap" style="width: 545px;">
<div class="csc-textpic-imagecolumn" style="width: 175px;">...</div>
<div class="csc-textpic-imagecolumn" style="width: 185px;">...</div>
<div class="csc-textpic-imagecolumn" style="width: 185px;">...</div>

this time the sum (175+185+185) is correct.

I've set:
styles.content.imgtext.maxW to 550 and
styles.content.imgtext.linkWrap.width to 550.

This is TYPO3 4.0.4 with css_styled_content 0.3.1.

The 2 pages with the same type c.e (one with correct sum one with problematic) use the same template.

(issue imported from #M5933)