Hello,
This a known bug that is linked to the Infinite Illusion interface. If you load that interface at any point, for the rest of your play session the assist links interface will experience this glitch. In every other case I have heard about so far, simply refreshing the miniclient will clear this up. If that is not the case for you, then your game files may have gotten corrupted. I would recommend doing a clean reinstall of the miniclient to attempt to clear up the issue. If this falls under all the "default suggestions" you have already tried and it does not work, then there is something more severe wrong with your game, and you will need to put in a customer support ticket to have it looked at. Here is the link, should the other fix fail to work.

https://support-center.oasgames.com/

Thanks and have a great day!