This might be a Joomla issue, but you have two positions that are named similar with one difference:

js_side_top and js_side_top_stacked.

When I try to place something in the js_side_top position, it automatically makes me pick the js_side_top_stacked.
I've cleared the search box and everything. In fact here's a video showing this:

picturemeclubbing.smugmug.com/Other/Vide.../n-R4H7k/i-R8HNb3J/A

Hi, Arthur.

It's because you already have (or had) module assigned to js_side_top_stacked.
Just type in manually js_side_top and hit enter.
This is not an issue at all as Joomla! show only positions that it is "aware" of. Doesn't "see" component built-in positions unless they ware used at leas once.

That's exactly what i did. I typed it fully out and hit enter. But it still puts the stacked one.

Hi, Arthur.

I've checked your site backend and this module position is set correctly: prntscr.com/7vmjg9
Nevertheless this issue (if still exist) has nothing to do with JomSocial as module is displayed and configured in com_modules (Joomla!)
I guess that this odd behaviour is rather related with browser.