Hi
Understand now. You renamed one URL, but you did not rename the duplicate that Joomla created.
Joomla often creates multiple URLs for the same page. In your case, it created both:
index.php?option=com_content&Itemid=759&catid=95&id=136&lang=lv&view=article
and
index.php?option=com_content&Itemid=759&id=136&lang=lv&view=article
(one has the catid and the other misses it).
When running automatically, sh404SEF preserves your site from this problem and only shows to visitors and search engines one URL (in this case: kapnes/metala-kapnes).
But as you renamed one of the two URLs Joomla has created, the other one is still there.
The solution is simply to rename the second URL, just like you renamed the first one.
Rgds