I was able to go in and create a copy of the original email and troubleshoot those issues. The main problem in that template was that the header image was 'stretching' out the template. Make sure that images you insert into the template are no larger than 600 pixels across. You can check this by looking at the dimensions of the image in the Library. The reason here is that most email platforms and mobile devices are optimized to show an email at a 600 pixel width maximum. Here is a helpful article about preparing your images to upload to Constant Contact, as well as this Community post on editing images!
As for question #3, I remade the block that contained "Member Assistance Program . Video Counseling . In-person Counseling." This should help, and when you come across anomalies such as that, we recommend that you try creating a new block and typing in the content directly into Constant Contact. Sometimes, if you copy and paste from an outside source, it can bring in hidden code that affects the formatting within Constant Contact. And to answer your last question, there isn't a feature to view or edit the HTML in this editor, however I will track your interest in this feature, and you will be notified when this changes.
If you have further questions, or need more help with this template, please email social_support(at)constantcontact(dot)com with your user name, a reference to this post, and your questions.