Bug with B.net app

The Battle net desktop app resizes itself to fill most of my screen, when tabbing out, or closing a game. it doesn’t always happen. This has been happening to me for the past week or two, and it’s getting annoying. Duel Monitor, each has an independent desktop. I keep the App dead center of the Main Screen, oft time I’ll tab to my desktop, or close and application like Hearthstone or WoW, or OW, and it’s filling 90% of my screen.