I now do see the dropped sidebar on your site at microcosmsfic.com
I just installed Colinear on a test site and put some widgets in the right sidebar. The sidebar is fine on my test site, so I suspect either a plugin conflict or an issue perhaps caused if you edited any theme files.
Here are some further troubleshooting steps you can try:
– Try temporarily deactivating all your plugins. Does the problem persist? If the problem is gone, reactivate your plugins one-by-one, look at the site in between each reactivation, to find the conflict.
– Undo all theme-file or CSS tweaks you’ve made so far.
Related, have you edited any theme files directly? If so, reinstall a fresh copy of the theme and move any tweaks into a child theme or custom CSS plugin so you don’t lose your changes every time you update the theme. Move them in bit by bit, checking the site in between each change.
If the dropped sidebar comes back, you’ll know the problematic code was somewhere in the last piece you added.