Copy and Pasting html causes extra words to be added randomly

I have created a page that uses the HTML macro to embed some html code that has a bunch on links on it. However when copying and pasting it onto confluence some words are added randomly thoughout. For example:

<a href="https://kibana.atlassian.io/app/kibana#/discover?...">Server</a>

Turns into:

<a href="Serverhttps://kibana.atlassian.io/app/kibana#/discover?...">Server</a>,

As you can see at the start of the href there is a 'Server' which breaks the link.
Attached is the original html code, the code after it has been pasted into confluence and the diff.

As far as I can tell it is something to do with the <>.