[Hummingbird] forms disappear while enable "Host my files on the WPMU DEV CDN"

When i enable enable "Host my files on the WPMU DEV CDN", all forms(created by Forminator) disappear.

When i disable "Host my files on the WPMU DEV CDN", all forms come back.

i tried in test.xxx.com, and replicate the same problem. both are multi-site.

i granted you access to my site, pls check.