I saw in the old_files folder that you have included the bootstrap.css v3.0.0 file. However, I can't file line where your project is including it. Is 3.0.0 the Bootstrap version that you are using or are you using some other version? Which file is it included it?
@digiexel,
Yes, we are using bootstrap.css v3.0.0. All these files present in old_files folder are not included anywhere in the project. Actually, all these files get minified and we get only one file wplms.min.css.