I've been struggling with this same issue during my Whole30 as well. My 3rd day in I'm pretty sure I had some chicken slathered in some sauce that had sugar listed as, like, the 10th ingredient (all the other ingredients were spices). I've also had uncured bacon with sugar in it, I think, every weekend. Not all of my meat is grass fed or pastured either.
My excuse? I'm not doing this to be perfect, although I am genuinely trying as hard as I can to stay compliant. I'm very busy--I have a 9 month old, I'm married and I'm working--and I'm doing this to get back on the right path 9 months postpartum. I've had insomnia on and off throughout my 20s and 30s, but since I became a mother it's been absolutely awful (I was sleeping 4 hours some nights even though my baby was sleeping soundly throughout the night). Insomnia was ruining my life: I was angry and impatient with my husband and child constantly, I would cry at everything, I couldn't think straight.....I was a mess.
My point is, stressing over sugar or whatever sneaking into my food even after I try my very best to be compliant and getting upset about it defeats the purpose of me doing it. The first time I did my Whole30, I did it perfectly (really, I think I did). Now I'm not going to let the perfect be the enemy of the very very good. I'm trying as hard as I can and I've seen some great results, all of which I'll post about when I finish up in 4 days!
Okay, that's my two cents!