left sidebar strange position after update

Hi @bl4d30r,
looks like you have a custom CSS that acts on the main content and primary (left in your case) sidebar width (and position).
This part:

.col-3cm .s1 {
  width: 260px;
  margin-left: -260px;
}

You might want to use stronger selectors according to the recent theme changes.
E.g.
.col-3cm .sidebar.s1

This doc might help to get the right selectors you need:
https://docs.presscustomizr.com/article/272-inspect-your-webpages-in-your-browser-with-the-development-tools

Hope this helps.