When clicking in the 1v1 DM checkbox, approximately half of the box actually affects the 1v1 RM option.
You can see the comparison in which box is highlighted.
Seems like the hitbox for 1v1 RM extends halfway into the DM 1v1 tick box
1 Like
My bad, didnt see the bug report forum 
Is this on the Steam or Windows Store versions?
Steam version.
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Thanks for reporting this.