Beginner's several Blueprint runtime errors

[Hellverd]

Guys, I

@Allenheathx

Sometimes this can happen even when your logic is more or less good but there is a brief moment in time where the variable hasn’t been set yet.

Don’t know if you get me right: guys. I have not made this bugged blueprints shown in log I know where are these broken nodes, but I have no idea how do they work exactly and they are all connected to something.
Look at this:

I assure you, I’m not capable of making such advanced blueprints… yet Everything is good in level one, level 2 has these logs even with blank level blueprint.