Spring/Keeper interference with Rocker

MOPAROFFICIAL said
You have multiple problems.
Wrong retainers, springs are bouncing and cutting rockers... boy oh boy

Great, lol.

So, more background; This motor has been together for 10+ years without issues, and probably only 1.5k miles on it in that time. (sits a lot). I have never heard this issue til this past fall. Any ideas on why it would just now become an issue?