Are you talking about a real Windows pc keyboard? If not you probably skiped one step for entering the time. After entering the number you have to click the "ok" at the keyboard and after that the ok from the Time Dialog Box. I think you Skip the "enter" confirmation at the keyboard.
Samsung Note Pro 12.2 LineageOS 14.1
Huawei Media Pad M3 lite
Huawei Media Pad M3 lite