If all you had for substrate was the coffee grounds the issue is mineral defect, usually you want to have the main part of the substrate wood chip based with coffee grounds added in (2/3:1/3) with a little rock dust mixed in for well formed fruits.
We love visitors, that's why we live in a secluded cabin deep in the woods. "Buzzard's Roost (Asnikiye Heca) Farm." Promoting permaculture to save our planet. you can call me Dr. Redhawk
No matter. Try again. Fail again. Fail better. This time, do it with this tiny ad:
Getting ready for the Better World Book kickstarter - February 2019