Bad Batch of Reef Crystals?

[ReeferFive-0]

I ordered a pallet of rc on black Friday sale and just opened my 5th bucket. All have measured at or really really close to 10 / 440 / 1350. I do know of bad batches as I received several bad bags years ago. I guess what I can't rap my head around is what exactly could be lacking or let's just say "off" that would cause a nutrient imbalance and sudden algae bloom? It's not making sense to me but am really curious as I still have a half pallet of this smack.

The algae on the glass got considerably better after I upped my calcium and magnesium back to acceptable levels. I'm guessing that these parameters being off played a role. If the few things I tested for were off by that much, then I'm assuming other trace elements were probably out of balance as well. This is why I'm going to do a few large water changes with the new bucket of salt and monitor.