# Loop Cut & Slide wont work over a face [duplicate]

So I am trying to make a building in Blender for my University Project. I have made the outside of the building and now I am trying to add windows with frames at the front. One side of my building has a window, which I created with no issues. Now I am trying to clone this on the other side of the building I am finding that the loop cut keeps skipping a face of my window for some reason, and I can't figure out why! I have a few screenshots (https://imgur.com/a/1HwDHmn) and hopefully, this shows what I mean. Any help would be appreciated.

Side note, this is my first ever time using Blender so I am not aware of many of the shortcuts etc.

EDIT: Here is my blend file: Removed, can be readded if needed. Don't want my work being flagged up when I upload it.

Thanks