OOOHH, THAT IS A CLEVER BUG FIND
You see, when you select the lane where yo start, the ui just goes offscreen and isnt deleted xD
It seems I also forgot to disable that button
And in godot if you click a button it goes in this focus state where you can just press the ui_accept action (which had space bar) to press it again.
So you can repeatedly press it even after its off-screen xD
Thanks for that report lmaoo, I cant belive i missed that bug