Can't Dock Vessels with Stock Canadarm

[MaianTrey]

So I've created a space shuttle with a Canadarm that uses Clampotron Jr's for the end effector. I cannot dock with the same vessel at all. It tries, but every time, they get stuck in a weird locked magnetized state just inches apart until I undock it from the arm. In the images below (in spoilers), they get stuck in that position, and one of the two docking ports is available to 'undock.' If I undock the connection to the arm, it will then dock correctly and close the gap that is shown, but not until then. It's the same for grabbing the module in the payload bay - I have to decouple it from the rest of the craft to get it to dock. Changing the magnetization of the docking ports has no effect.

Is this just how it is? I swear I've been able to get the docking to work correctly when Breaking Ground first released, but I haven't gotten it to do anything other than what's shown since then.

Spoiler

Docking a Zarya module to Unity on my shuttle's adapter.

Spoiler

Docking the Unity module onto the shuttle's adapter.