Can't save the forms

Hello.
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Days ago I tried to save a form but redirects me to a 403 forbidden page. The Chronoforms version is 5, I proved with mod_security off and the result is the same. If the form is void there are not errors and not 403 forbidden page.
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PHP version is 7.2.17

Does v6 work?

I don't know, the version installed is v5.
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What limitations has the v6 vs. v5?

Hi.
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I installed the v6 and imported the v5 forms but I don't get save the form in v6 neither.

Welp I dunno man it MUST be a security issue with your host.