It sounds like a security feature on the server is redirecting the connection when html escaped data is added to the URL. Take a look through your Apache configuration files and the vhost files and check any redirect rules you find, you will probably fine one has a regex pattern for identifying html escaped data and blocking it as a security precaution. If you don't want to go through all the configuration files you could try base64_encoding the escaped values which are causing the problems, I have done this before where a server was configured to block html escaped data in the URL and it worked as the base64_encoded string passed the regex pattern.
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