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I have checked your forms and I can see widgets are indeed loading on my end:
I have also submitted one of your forms and I got the Thank You page without any problem:
As far as I know we have not had any problems with our widgets recently, I have also cleared your forms cache.
Please check again, also check the settings of your internet connection, it may be a connection issue since the message you're getting is because the widgets resources cannot be loaded properly, may be that there is something blocking resources too.
If possible, please try on a different computer and internet connection, if the issue still persists, please let us know.