Irssi: Using ALT + # to switch windows works for all windows but the first one

Somewhat of a bizarre issue, I'm using irssi in iterm3, and I have iterm set to read the left escape key as "+ESC" as this is how I've gotten irssi to recognize pressing option and a number key to switch windows. However recently, while this works as usual for switching to windows 2 or higher, I can't use this shortcut to switch to window 1. I have to type out /window 1 every time I want the main window. Anybody have this issue, or know where to look? I can't see any conflicting shortcuts in iterm or anything.