What steps will reproduce the problem?

Unsure.

Expected output

Spawner drop.

/version output?

CraftBukkit version git-Spigot-f630541-a625e45 (MC: 1.10.2) (Implementing API version 1.10.2-R0.1-SNAPSHOT)

SilkSpawners version

SilkSpawners v3.7.3 --1.5 up to 1.10

Please provide any additional information below.

Link to my config: http://pastebin.com/TwbSW8y5
There is a chance I messed with a setting at the bottom of the config that caused this. If so any help would be nice.
I also think when I do a worldedit or something that lags the server and the player mines a spawner that it might not drop. Not sure how that works or it that is the issue.

Migrated from https://dev.bukkit.org/projects/silkspawners/issues/113

Unreproducible.