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Yes, definitely, R-19 will not be the net R-value in a 2x4 wall. R-19 is meant for 2x6 walls where R-13 is meant for 2x4 walls.
Visit www.owenscorning.com and email those folks for specifics. Just tell them that you found OC insulation w/such-and-such-a-problems as you stated. Ask them what the net R-value is in your current situation. ANd ask them what you should do. Oh, DO mention if it's Kraft-sided insulation too, or not.
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!