Hello Carolyn! I am guessing you are using the new ConDoc 4.7 doors and windows. Those are programmed to round to the nearest inch. I think… maybe 2″? Either way… If you have a weird sized opening, you should adjust to work with the window. Or… you can use the old 4.5 windows, those snap to any length. The advantage of the new 4.7 doors and windows is that they report back a tag that can be picked up in LayOut. Haven’t made that tutorial yet! Let me know if that solves it for you…