Summary: I have the game's resolution set to 1920x1080 (windowed). The game always launches in another resolution.
Steps to reproduce:
1. Set the game's resolution to 1920x1080, and screen mode to windowed under the Options>Graphics menu.
2. Restart the game.
The game opens in a different resolution. The options menu still says that it's 1920x1080.
The game opens in 1920x1080
When the game opens, select a different resolution from the drop down menu, then select 1920x1080 and hit apply.
Game version: Steam Production build 2940 ("Avalanche")
OS: KDE neon 5.8 (Ubuntu 16.04 derivative)