Installation is looking for files that aren't there

This problem has been bugging me for a while, so maybe one of you brilliant people can enlighten me about what I’m doing wrong.

When I develop WordPress sites, I start off with an installation on my personal host and then migrate it over when it’s mostly done. However, sometimes the directories for the themes I develop end up being slightly different. Usually a space between words that I hadn’t included on my personal host.

When I get it up and running, however, everything loads a bit slow. When I check it out, I find that the site is trying to load style.css and small-menu.js from the old theme directory I had used on my personal host. Usually, the installation also seems to be looking for versions of those files that have their version appended after the file type (at least in Network view).

One workaround is to create a second directory and simply put those two files in there. On one site, I noticed that I couldn’t change how the mobile version of the site displayed until I did that. The mobile browser wasn’t even looking at the normal CSS file. It was looking for the old one, and gave up when it couldn’t find it.

Changing the directory name was what set things amiss, so I’m hesitant to try that again. Creating a second directory is a poor solution, as well. I’ve tried finding where it might be calling for the old directory, but I only know enough about WordPress to be dangerous.

Digging through the database or the core PHP files is probably what I need to do, but I was hoping for a more experienced opinion first.

If you’re curious, you can see what I’m talking about here:Simple site I developed