im assuming your reffering to https://forum.weightgaming.com/t/renpy-help-choice-and-romance-point/44912
My guess is its indentation of renpy blocks, and or your use of jump or call. Keep in mind if you use jump that it moves you to the beginning of the label you jumped to, and renpy will execute each line in order right through that label into the next if there is a following one if there is one. Also if its hits the end of a file without another jump or call being called renpy would end the current call stack and if there is nothing to return to that would end the game and dump the player at the main menu.
By the look at your other post there is no jump at the end of your labels meaning when your menu choice jumps you to the label because the other label follows it when your done with the label renpy proceeds to execute the following label.
A knowlegable member @dingotush made a post about renpy, may wann have a look at it here → https://forum.weightgaming.com/t/some-notes-about-renpy/20786/1