my character malfunctions when transitioning to another map using an Open Level node.

Hello, I’ve implemented a Point & Click movement system using the right mouse button, but there’s a serious problem.
When transitioning from the main menu to the map where the character is located, I can control the character, but
I have to keep double-clicking to make a single move.
It’s like playing a game in an environment with a high ping of abt 300ms.

Interestingly, the problem is resolved when I change the ‘Set Input Mode Game Only’ node to ‘Set Input Mode Game and UI’.
I can’t understand why this is happening.
Why does it behave like this?
I want to make the game work properly using the ‘Set Input Mode Game Only’ node.
pls help!