Unexpected extra instruments when cycling through drum kit

I’d like to head off any potential issues with my drum kit setup and would appreciate some insight into the following. When cycling through the drum kit instruments (in Write mode) using the up and down arrows, I’m seeing additional instruments that don’t appear in the Edit Percussion Kit screen. For example, I have only one kick drum defined, yet when cycling through the kit two kick drums appear (K. Dr. 1 and K. Dr. 2).

How is this possible, and are there any potential issues this behaviour could cause down the line?