In URL there are way to encode some characters for compatibility reasons [https://www.w3schools.com/tags/ref_urlencode.ASP](https://www.w3schools.com/tags/ref_urlencode.ASP)
%3A is ; and %20 is a space, so “ELI5: ” can be written as “ELI%3A%20” in some situations, this is often because : and space is not allowed, the are often used for control purposes.
For some reason, the browser, char set or something else results in an encoding that is not decoded by Reddits website.
So easy to explain why it is %3A%20 you get but harder to know why it happened and you get in instead of “: “
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