I am having this same issue. I was trying to display one form in the footer and the other in a contact section. One displays while the other shows the loading pulsing animation. In the developer console I get two error messages.
Uncaught SyntaxError: Unexpected token <
Uncaught ReferenceError: nfForms is not defined
at n.initialize (formData.js:20)
at n.s.Object (front-end-deps.js?ver=3.0.31&nocache=1:20)
at new n (backbone.min.js?ver=1.2.3&nocache=1:1)
at n.initialize (loadControllers.js:130)
at n.s.Object (front-end-deps.js?ver=3.0.31&nocache=1:20)
at new n (backbone.min.js?ver=1.2.3&nocache=1:1)
at n.initialize (main.js:58)
at n.s.Object (front-end-deps.js?ver=3.0.31&nocache=1:20)
at n.constructor (front-end-deps.js?ver=3.0.31&nocache=1:21)
at new n (backbone.min.js?ver=1.2.3&nocache=1:1)