Strange 20 fuse? Why would this be?

Could there be a reason for this fuse? If I’m reading the diagram right, shouldn’t it be a 10? Everything works, was trying to diagnose bad reverse lights. The actual problem was a bad wire at the plug before the switch in the transmission. I need to wire in a new plug.

2006 manual 5spd.

Any ideas? Should I change the fuse or leave well enough alone?

 

Change it back to a 10A. Just changing the size of a fuse to keep it from blowing is quite the hackery and negates the point of having one in the first place

 

someone probably switched it out to a higher amp fuse because it kept blowing. stupid way to "fix" it as it can cause a lot more damage. switch it back to the 10A.

 

That’s the tail light fuse.
It should be a 10A fuse.

The reverse lights use the 10A IG1 fuse.