I can confirm this is a problem that is related to Discord’s overlay features. To disable them open Discord and follow these steps:
- Look for your Discord tag and icon in the lower left corner of the discord window and click the
icon. - In the Activity Settings in the left-side options navigation pane and click on Game Overlay
- At the top of the main panel, look for “Enable in-game overlay” and toggle it off (going from green to gray)
- Restart Overwatch
Note, disabling the overlay affects all compatible games with Discord.