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| Couldn't be rain (here), big square alfalfa put up good and in a stack are safe, assuming good tight stack the worst that can happen is top bales get a little spoilage on the outside, maybe down between bales a bit.
So just about has to be how they were put up. Did you have 'wet spots'? Some things that cause wet spots, low lying area that may have been flooded, swather plugs or wind piles in the windrow, large windrow compaction areas (traffic), areas with significantly larger stems (stem moisture takes longer to get out of big stems, variety change or thin areas can cause this), areas with a different crop (oats are notorious for burning as the do not uniformly dry, here).
In order for a big bale to burn it needs a significant wet spot in it. Baler monitor should show a good average, but operator has to be pretty experienced and watching close to catch wet spots (more likely visible in the bale as discolored spots). Just my experience from putting up a lot of big squares here in the desert, no disrespect intended if you have lots of experience as well. The joys of making hay.
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Hay burning
