This is the correct location, apologies for the delay.
The theme layout issue is an easy fix. Please refer to this FAQ, especially the section about the
pre HTML tags.
The issue with the content tray and the category is being caused, by the theme, I think. I say that because, reading the code, it seems it is for slider controls and that is usually built into the theme. However, if it isn’t and you have slider plugins installed, try deactivating all of them to see if the issue resolves itself.
If you had slider plugins and deactivating them did not work, then the issue is likely with the theme and you you’ll have to contact the theme author to fix.
I hope this helps.
One last question, is this your theme?