Plugin is creating accounts without a slash before the folder name

Been struggling with this one for a bit, figured I would ask for a little help.

When I sign up for an account on my site, say i use the domain, it creates the account, but it incorrectly creates the url. It shows up in the admin panel as mywpmusite.comtest. Note there is no slash before the word test in the url. So I have to manually edit that from the network admin dashboard before i can access it. I have been digging around all of my settings looking for a missing trailing slash somewhere, but I can't find it.

Any ideas?