Sometimes strange behavior can happen during an HTTPS setup. There's a few places that need to get updated when configuring HTTPS, and having an unexpected value in one of the areas might cause the problem you're seeing.
Let's take a look at these areas:
Any screenshots you can provide of the garbling and the configuration of your server.xml (and reverse proxy configuration if you're using a reverse proxy) would be helpful to troubleshoot. Hopefully it's just the base URL but the additional information will be needed to keep troubleshooting if it's not.
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