Melting isn’t overheating. And, as I said, that would be a problem with the socket, or specifically what’s around the socket. If your socket is making your LEDs melt faster than incandescent burn out, then your socket is a fire hazard. Replace it with something that doesn’t suck.
That is ludicrous! Melting IS associated with heat. Do you know there are molecular-sized things going on inside an LED? The diode junction is but a few molecular layers thick. It can melt without any obvious damage when observed by eye.
LED lights are poorly designed, like most everything else from China. All it takes is for the LED die to be mounted on its heat sink with an insufficient amount of heat conductive glue. It is also possible to compound that glue incorrectly so that it doesn't conduct heat well enough to keep the junction cool. The heat sink itself can be undersized or not positioned properly to get airflow to take the heat away. The airflow in the fixture can be restricted so the airflow isn't fast enough. Before you give me a song and dance about airflow, we are talking convection cooling.