Tables not displaying correctly

Hi,

I had table cells on this page split evenly in 3 parts: http://bit.ly/1prLkos However I didn’t visit the website for a few weeks and apparently in the meantime something updated. Now the tables cells are resolutely in 3 uneven cells, though none of the code has changed. I tried changing the td style, adding divs, searching through theme stylesheets – to no avail.

The culprit, found through the browser code inspector, seems to be .entry-content td {width: 50%}. If I change it to 33% it is fine. But I do not know what’s producing this 50%. The source is [index]. Anyone know how to change this?

Thanks!