Had the same problem with a brown as well. My first all grain. I determined my errors were;
Mash too high. 163F
(too many unfermentables!)
recipe for 5gal batch
(ended up with 6.08gals)
This all equals.
1.039 OG when aimming for 1.05
1.019 Fg when aimming for 1.007.
Sad..