My server has been using Block 73 for a very long time for protection fields, fairly recently when you break Block 73 it gives you back the PS stone but also gives you EXP and several redstone dust, this doesn't happen with block 74.

What changed? Did you update CraftBukkit, did you update PreciousStones? If so from what version to what version.

I'm not exactly sure what has caused it, its been an issue for a month or more now I just never bothered to report but I'm trying to iron out the last few issues on our server. Are you able to recreate it? Using PreciousStones 302 and Spigot 866 at the moment. I want to try a few things, but atm I cannot log into Minecraft, seems to be offline right now.