We use a water-based (eco-friendly) glue in some of our shoe production, and once in a while the glue doesn’t set between the heel and its lift. We apologize immensely for this, and recommend contacting your local store immediately if you find your heels are having this issue, as it can be re-glued very quickly and easily. If your shoes are under the 1 year warranty, contact your closest Fluevog store and they will glue them back up for you, or reimburse you for the cobbler’s fee. If you need a replacement heel lift, give the Fluevog store a shout and they will send you one.