I used mass add in to put items in a group set up to win 20 items. Seemed to work but now on my Groups page I see 67 items in the group, but when I click view items, only 11 are viewable. Can this be fixed without deleting the group name?

Did you disable showing "Buy It Now" items? If so, then the other items may be listed as "Buy It Now" and that's why you don't see those.
You can enable displaying "Buy It Now" items in your Profile.

Here are screenshots of my Groups page and Group Items.

Group.jpg
Items.jpg

Found the issue. That's due to the category where those items listed.
I made a quick fix for now. Please check. You will have to add those items again using mass add.

Strangely, 2 out of 56 items added in the mass add in yesterday have just now appeared. I had set same price for all 56 and activated the snipes, however that apparently did not transfer. Perhaps it has something to do with being in the Adult category?

That's correct. eBay handles Adult category differently so I had to make a chance to handle it properly.
The 2 items you got now is the items I added when was testing the changes. It should have your original settings, I just added the items into the system.

Wow, I'm making a donation. I've never found better customer service. Thank you.