Sometimes the glue just fails.I have found in the past that Ferr-l-lite becomes too brittle,may hold good at first but the nwext year it would fail.Maybe the point wasn't cleaned good when the points were installed? What I did with my points was to take a NPT 1/16-27 pipe tap and tap some threads in the point to give it some teeth.Then clean the point with alcohol and use a white colored hot melt,it was stronger and didn't become too brittle.I didn't loose anymore points in a target with the proper prep.And also I carried a bar of soap and rubbed it on the arrow end for easier target removal,I shot heavier bows and was harder to pull arrows.