**WARNING THIS REPLY WILL CONTAIN PROGRESSION SPOILERS**
The objectives are not completely linear, after finding the deer statue there are many possible "next steps" to open shortcuts and pave the way deeper into the jungle. The next big objective you'll want to work on would be finding a torch for Janet which can be done in 2 ways. Either using the sunken wilds fast-travel map location, going right and exploring the bottom right side of this area, OR climbing up the waterfall in the normal jungle area with Janet and finding a cave to the right.
The ?s on the route screen will never change, those are static images. The purpose is to show where a "shortcut" needs to be opened, once that shortcut is opened the route will not update accordingly, it's simply a basic guideline as to what might be blocked off, and what general area the characters want to do within the main zone.
I only created routes for the starting area because they are meant to give a general idea as to where to go, after this I wanted players to discover the other zones on their own.
I think I know the bug you're talking about and will fix it asap!
I also understand maze levels aren't for everyone, it does take a lot of knowledge and exploring to find out "where to go" so I understand if you don't enjoy the format
To help anyone who might want guidance I will provide a basic list of objectives you will want to do to progress. This is focusing on core objectives, you will still need to open shortcuts and whatnot with other characters to complete these.
1. Use Edward to find the deer statue in the caves below the main island (1004x1003)
2. Use Janet to climb to the top of the main island and open the water dam, you can get here by climbing the wall near the starting area, then climbing the next wall after it
3. Take Randall to west beach and use him to unlock the fast travel point here
4. Take Randall to Sunken Wilds via West Beach and use him to unlock the map location there
5. Get a torch for Janet from the sunken wilds (1003x1013) or the upper jungle (1009x999)
5.1 Use Janet to open the shortcut in the upper part of the jungle (1007x999)
6. Enter the cave in West Beach (997x1008) with Janet and solve the puzzle here (you do not need anything to solve this except Edward's dream in step 1, the clues for the puzzle are found on the obelisks around West Beach) (SPOILER the code is 2,3,4,1)
7. With Edward go to the Deep Canopy (1010x994) after Janet solved the puzzle this door is now open. After finishing this section climb the Deep Canopy mountain with Edward and use the water dam. (1013x991)
8. Take Edward to the Volcano and complete the fall section to open the path
9. Take Janet to the dark caves in West Beach (1002x1010) and open the shortcut
10. Fast Travel Randall to Sunken Wilds and use him to explore left of this region until finding a way back to the main island. From here use him to gain access to the Volcano and unlock it.
11. Fast travel Janet to the Volcano and explore the right side (you will find a spear)
12. Take Janet to Deep Canopy and go to the far left. Use Janet's spear to clear the way forward
13. Take Randall to Deep Canopy and go far left to unlock the map location
14. You can now access the ending from the Deep Canopy map area using Edward GGs