Learning Pygame, troubles with multiple key pressed at once

Hello there !
I’ve been following a tutorial for a bit that teach me the basic of pygame, and i’ve been stuck with a little issue that wasn’t flagged in the original content that i follow.

Here is the link to download the pics used in the program : https://techwithtim.net/tutorials/game-development-with-python/pygame-tutorial/pygame-animation/

Here is the code : FirstGameUpme.txt (6.4 KB)

My issue is : When I maintain UP + LEFT and then try to shoot bullets with spacebar, it doesn’t shoot (while this work with UP + RIGHT keys).
I still can’t find why it does that and how to fix this, any idea?
Thanks !