Sunflower seeds -- feeding concerns?

I've been purchasing black oil sunflower seeds to include in my poultry rations for a little while now.  My local feed store seems to carry four or five 'brands' in some sort of rotation (I'm assuming just what is available from a particular dealer any given week).

The most recent bags I purchased have a warning printed on them that instructs me to "Wash hands after handling."  It also states that the seeds are "For wild bird feeding only."  Every bag I have purchased, no matter the source, has stated that they are for (wild) bird feeding, but this is the first that I have noticed that has given the hand washing warning.

I called the company and was told that there are "government regulations" that dictate packaging information, though, again, they don't all have this warning.  The man I spoke with said that there is nothing but the sunflower seeds in the bag (indeed, the bag says "Ingredients: Black oil sunflower seeds"), that they are packaged "as they come out of the field."  I did notice a particular aroma coming from the bag/seeds that I could best describe as "chemically," though I did not mention this in my phone call.  I've noticed a similar aroma in other bags, though this one was decidedly stronger.

I'm wondering if anyone can shed some light here?  Anybody know the ins and outs of commercial sunflower seed growing?  Ever had any problems feeding purchased sunflower seeds?

I think the labeling is to distinguish them from sunflower seeds for human consumption.

I've been feeding them for years and so far have not seen any detrimental effects.

I think they have been making my girls eggs extra creamy, which is actually disconcerting....

I sprout my sunflower seed. If it wouldn't sprout that would be a red flag.