The vid above does not explain the issue. It’s something completely different than proximity issues. We’d need to see the script, collision settings, Construct Script, Begin Play and so on. Another vid may not help much, I fear.
- check the collision settings of the trigger boxes vs the character’s capsule
- remove the DoOnce nodes (for now at least) - perhaps something else overlaps the trigger and DoOnce does not let anything else through
- check what the game mode is spawning in the outliner when you play from the beginning vs Play form Here. Is it the same character class?
- step through any code that is in the Construct Script / Begin Play? Anything suspicious? Possession? Run-time collision settings?
What I am saying is that this a very unorthodox scenario and something very specific would need to take place for the script to behave like it does. Read it as:
I have not a clue how to replicate it and suggest something tangible
Can you create a new level, add the trigger boxes and replicate it?