This is a huge problem for gluten free prepackaged foods, in particular, too. Not only do they so often contain so many simple carbs that I find it almost impossible to dose properly for with my usual ICR (and hadn’t thought that the carb counts might be off, but it’s probably that, too!), but I heard from another t1 that one of the prepared meal brands was way off, and oddly in the wrong direction - she dosed for probably half the carbs it said it was, because she couldn’t believe the carb count was that high, and she still went low! This is why I have one of those meals in my freezer that I’ve been afraid to touch… 
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