Bukkit

What steps will reproduce the problem?
1. Install PEX.
2. Copy paste the permission snippets in the permissions.yml.
3. Demote yourself to Paria and you will notice that you have permission to place a rankup sign but not to use it.

What is the expected output? What do you see instead?
I used the rankup.rankup permission first for Paria but since that didn't work I used the rankup.* permission. Now Parias are allowed to reload the plugin, build signs and such but can still not rankup.

What version of the product are you using?
PermissionsEx v1.23.1 and Rankup 1.3.1 on Spigot 1.8 Builtools 21.

Do you have an error log of what happened?
There is is no error log but I can provide you a snippet of my permissions.
groups:
  Paria:
    permissions:
    - bukkit.command.version
    - bukkit.broadcast.user
    - essentials.eco.loan
    - essentials.afk
    - essentials.afk.auto
    - essentials.build
    - essentials.signs.use.gamemode
    - essentials.geoip.show
    - essentials.protect.damage.lightning
    - essentials.signs.use.protection
    - essentials.signs.use.info
    - essentials.signs.use.warp
    - firstjoinplus.notify
    - modifyworld.*
    - rankup.rankup
    options:
      build: true
      prefix: '&0|&6 Paria&0 |&d '
      default: true
      rank: '1000'

Paria should promote to Peasant...
  Peasant:
    permissions:
    - arena.leave
    - arena.join.spleef
    - bukkit.command.me
    - bukkit.command.ban.list
    - bukkit.command.kill
    - bukkit.command.help
    - bukkit.command.tell
    - ChestShop.buy
    - ChestShop.sell
    - cha.saddle
    - cha.iha
    - cha.gha
    - cha.dha
    - cha.tag
    - essentials.signs.use.buy
    - essentials.signs.use.sell
    - essentials.signs.use.trade
    - essentials.signs.use.balance
    - essentials.signs.create.balance
    - essentials.signs.break.balance
    - essentials.signs.use.disposal
    - essentials.signs.use.heal
    - essentials.signs.use.kit
    - essentials.signs.use.repair
    - essentials.mail.send
    - essentials.tell
    - essentials.me
    - essentials.pay
    - essentials.balance
    - essentials.sell
    - essentials.back
    - essentials.afk
    - essentials.list
    - essentials.msg
    - essentials.warp.list
    - essentials.spawn
    - essentials.tpa
    - essentials.tpahere
    - essentials.tpaccept
    - essentials.home
    - essentials.sethome
    - essentials.sethome.multiple
    - essentials.sethome.multiple.[Peasant]
    inheritance:
    - Paria
    options:
      build: true
      prefix: '&0|&6 Peasant&0 |&3 '
      default: false
      rank: '900'

Please provide any additional information below.
For convenience, I have not copied all of the corresponding permissions because they are unrelated.
Is it a fault on my end? Or something technical?