From top to bottom my B21 manual says, 1. Key Stop 5 amp, 2. Head Lights 10 amps, 3. Work Lights 15 amps, 4. Horn 5 amps, 5. Hazard Lights 10 amps. Number 6 is not listed and may well be a spare fuse holder.
Looks like your running fuses that are a bit too big.
MarkV