help, middle layer on pumpkin and melon farm not growing?

[Turrniip]

title, I copied a design I had seen many people using but for some reason, the middle layer just won't grow? I have my time set to midday and have copied it block for block from a working design so idk what to do.

free plugins
minecraft paid for free
SpigotMC
minecraft plugins
mcmarket
mc-market
spigotmc
free minecraft paid plugins
free minecraft plugins
aac free
ewg free
Minecraft Premium Plugins
ewg free download
litebans free
epicworldgenerator free
free schematics
leaked schematics minecraft
schematics
schematics leaked
schematics free
minecraft schematics free
paid minecraft schematics free
paid minecraft schematics for free
free cracked plugins
free cracked minecraft plugins
plugins
featherboard download
featherboard plugin download
antiaura download
xenforo leaked
xenforo for free
xenforo addons