Corrupted links automaticly created

Hello,

I run this plugin in some of my sites. All have been working smoothly until a few days ago I stopped seeing the click number update in my affiliate dashboard. It is set to zero for several days.

After checking other things, I realized that the links that are being generated by the plugin are not valid. I coppy here an example:

The problem is that after the tag, instead of a “&”, there is the string “amp;”. This thing happened without me doing anything to the plugin or the site itself. Is it a known issue? Is there any workaround?

The page I need help with: [log in to see the link]