hi
the reason your sidebar is below the posts column is because it is defined that way in the html the browser is seeing.
The sidebar is class “sidebarcolumn” which is contained within class “maincontentcolumn”. It needs to be AFTER class “maincontentcolumn” has closed rather than within it.
I believe the reason its showing up that way is bad html on your homepage. your page validates with 38 errors
https://validator.w3.org/check?uri=https://www.stylistiet.com/
The problematic errors are the ones at the bottom of the list, “xhtml parsing errors”. These represent mismatched or unclosed div’s and other tags, and are causing your page to be defined to the browser not the way they were intended to.
It looks like some of the problem may be coming from plugins. I suggest fixing this by turning off all plugins and revalidating the site with plugins turned off. Then get the site fixed so the sidebar is in the right place with no plugins active. After you have done that, start turning plugins on one by one. If you find activing one throws the sidebar off you have found your culprit.
I realize this is a pain.
I also suggest you add a float: left
to these two css sections:
line 131
#page {
background-color:#FFFFFF;
clear:both;
margin:0 auto 5px;
}
line 145
#columns {
background-color:#FFFFFF;
margin:0;
padding:5px;
}