I have just had a quick scan of around 10 of your hubs to see if there is a reason for any to be flagged by hubbers as sub-standard. What I have found is that, although reasonably well-written, they are rather short.
All I can surmise is that one particular hubber decided that the hub in question was just too short for their taste. You have probably been unlucky enough to have attracted a self-appointed conscientious hubber to your hub that took it upon themselves to flag it.
Check with the powers that be, but before doing that, review it yourself for total content, and if it is short then expand it somewhat so as to overcome any implied brevity.