Sometimes, but not always, when typing a command very fast, the slash appears after the command. This, coupled with the backspace glitch (MCPE-28255) makes it annoying for people like me who type commands like /time set day and /weather clear frequently.

RECREATION:
1. Type a command very quickly
2. Sometimes (But not always) the slash will appear after the command

Examples:
weather clear/ instead of /weather clear
time set day/ instead of /time set day

P.S.
/time set day is more likely to encounter this glitch than /weather clear, but both may do this.