Unless you mean the confirmation message after completing the command (in which case you would just need to use the command in the channel you want it to appear), it sounds like you have enabled score & points logging which is creating a separate notification message in your chosen channel. You can disable this setting on the dashboard under servers > your server > rewards & economy > score & points > points & score logs, by removing the channel listed. Alternatively, you could change the channel to one of your private logging channels in case you want to keep track of admins giving out score/points.