GravityForms | Multiupload is not working with barba.js

I have a problem with the multiupload. If I open the page where form is directly, then the multipload field works without problems. However, if I open another page before and then call the page via Ajax (Barba.js), then the field no longer has any function.

Have a look: Jobs – theme-minimal (just click on the third box and scroll a little bit down).