Thanks for letting us know about the issue you're experiencing.
Please reply here with the serial number of the Roku device associated with the affected remote. It can be located by navigating to Settings > System > About or at the back of the device itself.
However, if it's a Roku TV remote, please be advised that remotes for Roku TVs are manufactured directly by the TV manufacturer. We would recommend reaching out to their support team to report the issue and for further help.