Main Nav glyphicons?

So I had everything set up nicely. Then the client wanted a gallery. I added a gallery page and link. But then notice an odd gap in that on the link underneath. Unlike the other links. So view the code and I see this:

<span class=”glyphicon Welcome”></span> Home
<span class=”glyphicon About”></span> About
<span class=”glyphicon Blogs”></span> Blog
Gallery
<span class=”glyphicon Contact Us”></span> Contact

What are these glyphicons? How do I either remove them or make gallery have one to match spacing? In reality, it is the   doing it.

I’m somewhat new to WordPress, prefer building a custom CMS to what the client needs. But they wanted this. I thought I saw something for this, but I am so lost in something that is new to me.

Thanks!