What are you experiencing that leads you to this conclusion?
A couple of checks to see whether you're the right tier ingame and/or to gather more info for the bug:
- When you do /climits what is the 2nd number on the 2nd line, ie Chests: something/this number? (This shows how many LWCs on chests you are entitled to.) Is it 13 (tier 3) or 20 (tier 8)?
- Do /title list - what's the highest tier suffix you have? Is it 8?
If these both show you to be tier 8 with the correct perms, have you possibly made more than your allowance of free LWCs at some stage? In which case, you'll need to petition for a reset as per
these instructions at the wiki.