You should really learn about absolute and relative paths. What you're using is a relative path.
This is an absolute path on your server:
<img src="/images/logo.png">
This is an url with http protocol - opens Google.com
<a href="http://google.com">Google</a>
This is an url without explicit protocol, it will turn into http or https based on what your page uses:
<a href="//google.com">Google</a>
Use one of those for what you need (typically the http one).
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