Logical errors are an entire domain of programmer troubleshooting. All you'll have to do is attempt to learn programming, and you WILL write something that throws no errors, performs terribly, and confuses you for hours.

We all do. It's almost a badge of honor to push past a few of them.

Hell, sometimes it happens when no one has made an error but a particular mix of data or odd arrangement of hardware it ends up running on hits an undiscovered edge case that buggers things up.