Input controls at run time reset to duplicate controls, why does this happen?

What I mean by the question is, I have 2 axes defined in the Input Manager with the same name (TabMenu).

In the Input Manager I set the first TabMenu to execute when you press tab on the keyboard. On the second TabMenu it's set to joystick 1 button 3 and the alternative positive button is set to joystick 1 button 6.

When I build and run the project, the Input Configuration for the TabMenu controls somehow duplicates itself. In other words, there is two rows with TabMenu (Which it should be) but they are identical, with no tab key defined. So if you play the game now, pressing tab will do nothing, but pressing joystick 1 button 3 and joystick 1 button 6 enables you to go into the Tab Menu (Which is what should happen at least).

I also find that if you change any one of the TabMenu controls to tab (Keyboard key) in the Input Configuration (Not the Input Manager), then it works temporarily, but if you exit the game then go back in, suddenly both TabMenu controls are tab with joystick 1 Button 6 as the Secondary, so now joystick 1 Button 3 doesn't work.

This has given me a big headache so any help will be appreciated.