Nice save.
What sort of glue did you use for the original splice?
I've had the same thing happen twice, when using consumer grade, hardware store epoxy(24hr).
One started to peel apart during tillering. The glue was very rubbery. Used heat, and acetone to remove residue and re glued with bow making epoxy.
Another splice got shocked when my ELB's lower limb struck a modern steel ground quiver at a crowded shooting line. Everyone else was shooting recurves or compounds, so their bow limbs were okay, much shorter and cleared the quiver. My limb was unharmed, but the shock travelled up into the splice and tore the glue line apart. The bow started to peel apart at the splice with every consecutive shot, until I realised what was going on, and stopped shooting.
Once again, quality epoxy and or wrapping the completed splice in twine bedded on epoxy and rubbed into the twine for extra measure stops the problem.