Okay, so the Issue is that there was quite a bit of a legal bullshit in Europe regarding Users posting Links at all, so I needed to make sure that every single thing people normally link to is whitelisted.
As far as I see 2 of your 3 Links are whitelisted, but the spigotmc.org one is not yet. Easy to fix for me. ^^
And usually I see people bypassing the Link restriction by putting a “(dot)” or something instead of a “.”, and then I will whitelist the thing usually. 