SharePoint 2013 Not Loading CSS On Site Template

Hi 

I have a question regarding adding a site collection with a custom template ( by selecting a template later option)

Basically I have a site that I need to move over from one server to another. The template saves as a template no problem with all lists etc.

When adding the site collection, I choose custom and select template later. After going to the site collection it then asks to pick a template, after which I choose solution gallery and upload and activate the site template I made before. I then return to template picker page and choose the custom template uploaded

The problem I am having is that when the template is chosen and being used it does not load any of the css or anything. Everything is just listed downwards and all jumbled up all over the place.

Both servers are running SP2013. The Site Template doesnt have any major things on it apart from some custom new/edit forms and normal SPD 2013 Workflows.

Any ideas on how I can get the CSS to load?