Bananagardendreamboy

No way to know for sure but the roots have to be a bit under developed because like you said usually these plants can withstand a good amount of wind and abuse before tipping over. My namwah has withstood some pretty strong gusts. I would probably pull the mulch away and buy some cheap garden soil or top soil. Maybe a yard in my pickup or just buy the bag if you need to and spread it all around. Then stomp it down or tamp it in some spots. Then put the mulch back up. Like someone said earlier the soil may be not compact enough?

Good luck dude either way, rare problem to run into and your watering schedule is exactly like mine in 9b