I'm not sure what would be causing this. Your equipment must be level 5 to begin enhancing it. Other than that, all I can say is to gather as many details as you can, (phone model, OS version, Haypi version, any odd thing that you think may be related and any screenshots you think may be relevant) and mail
kingdomsupport@haypi.com. Also, deleting the app and redownloading it occasionally fixes some problems. Hope it works out for you soon.