JQuery not found - website only available in debug mode

Hello dear balbooa team,
we've created a gridbox website and then moved it to another host, where the website suddenly is not visible anymore - console gives many errors, e.g. jquery not found, though the jquery files are indeed on the server.
Our host only advised us to run the website in debug mode, as it's visible then, but we know this can't be a longtime solution. I guess it probably has to do with the host, if it worked on another one - but do you have an idea what could cause this and what we could ask them to do?
Thanks in advance!

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