Dispensers play the wrong sound file when lighting a fire with flint and steel.
The game plays the sound file for dispensers when they are "empty".

In other words, there are two sound files for dispensers. One for when they have contents inside, and the other for when they are empty. I'm saying that the game treats the dispensers as empty when it chooses the sound file, but the dispenser still uses the Flint & Steel.
If that makes any sense.

It is just a minor bug, but a bug none the less.