Content is overheading the footer

an example:

https://frontpage.klifix.nl/2006/07/21/klifix-schaft-nieuwe-hypermoderne-pc-aan/

May be one or more of these 132 errors:
https://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Ffrontpage.klifix.nl%2F2006%2F07%2F21%2Fklifix-schaft-nieuwe-hypermoderne-pc-aan%2F

Try cleaning that up…

Well, that’s more than 132, I found 145, yikes!
Most of them aren’t to be found in the theme…
I will try to fix them anyway, but you haven’t got a clue?

Hard to tell with all the errors. My experience has been that isolating the issue is damn near impossible unless the code is pretty clean.

Could be an imbalanced div or a float that isn’t ‘clear’ed. Purely guessing.

Well, allright! First I will try to clean up the errors, if the problem is still there then I will be back here again ??

Thanx Yosemite!