Touchback rule is broken in OT

Was just playing a game that went into overtime and on the first possession, the offense fumbled the ball out of the endzone. Instead of the defense getting a turnover and the ball being placed at the 20, the offense kept the ball but got moved back all the way to their own 20. When I forced yet another fumble it was treated as the end of first OT so I never touched the ball on offense despite forcing 2 fumbles