Baffling Custom 'Portfolio' Problem…

This is a bit tricky to try and explain, and I apologize in advance if this sounds naive or too vague, but here it goes…

I took over work on a website for someone recently after they had a custom theme built for their company. The site offers food tours. Up until recently, the site only had 3 tours, which ran perfectly. The way it worked was they would go in and add restaurants, assign each to a category and when you’d view the tour in question, the restaurant assigned would display in a div on that tour, according to the category you assigned to it. So for example, if I added a new tour called NEW YORK, then went in and added a restaurant called FAR EAST, gave that a category of INDIAN, then went back and viewed the NEW YORK page, it should be displaying.

When we try and add a new tour (or even clone an older one using the Duplicate Post plugin), the previously working tours still look great, displays everything properly, but adding anything new moving forward doesn’t pull in those categorized restaurants we added in the first step.

It’s complicated, because it’s a very messy design and I’m still trying to make heads or tails of how everything works. I’m wondering if anyone has any suggestions as to what could be causing the site to function properly with older pages, but failing when trying to add new ones.

Here is a link to a working tour. There is a “…Stops At” div where the restaurants have been giving a category and should be displayed: https://seattlefoodtours.com/tours/pike-place-market

Here is a link to a new tour we’re trying to add, where we’ve added some new restaurants, given them a new category, added a new tour…but as you can see, nothing displays in the “…Stops At” div where the previous tours display the restaurants: https://seattlefoodtours.com/tours/market-to-table-with-chef-traci-post

I know it’s impossible to tell me exactly what’s going on without seeing how the site is built from the inside…but I’m wondering if there’s anyone out there that might have some idea of where I could start. I’ve looked through all the custom pages and the functions.php file to see if there was something I needed to register before it would work, but I can’t seem to locate the culprit.

Again, apologies for the vagueness…I’m a little lost myself.

Thanks in advance.

Here’s the functions.php file as it exists…in case this tells you anything:

[ 560 lines of code moderated. That’s just too much, for many lines of code please pastebin.com instead. ]