Unfortunately we can't put the blame on just one thing - it's best to take a look at the overall diet. It takes some experimenting to see what our body responds best to.
I'd suggest using your diet log, see how many calories you're consuming each day and compare that to the amount you require in a day. You can find these calculators online. Here's an example
There are also some foods that promote inflammatory responses in some people that may hinder weight loss. In addition, not eating enough can cause a sluggish metabolism.
I don't see any red flags with what you posted above - I would omit the juices if you're buying them pre-prepared as those are often mostly sugar. The pesto can be loaded with oil and BBQ and wing sauce usually contain added sugar too.
Head over to our Weight Loss Forum for some great posts from Wally Bishop who has been in your shoes and can help with some personal tips and tricks that he used. If you're still curious, post another Q there and we'll be happy to help you along your journey :)