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White sprays, whether primer or plain enamel paint, tend to be a bit finicky - I would imagine it has something to do with the pigmentation, as that seems like it would be the only variable. In any case, I find that I need to spray closer to a surface with white to avoid a chalky finish (never had it as severe as yours, but it's the same phenomenon). Since the spray is more concentrated the closer you are to the nozzle, you'll have to move faster to compensate or you'll risk overloading the models.
Army Painter primers are known to require a bit of adjustment in spray technique, generally. Add in the common issues with white sprays and it's no surprise it gave you trouble. Give the can a thorough shake, keep it at a reasonable temperature, and practice on some scrap until you've got the proper distance down. There's little you can do for the current lot except strip them and try again, once you've adjusted your technique.
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