Is there a place to download old versions? Github page only shows 13.2 as the lowest and your website links are dead.
First things first, there was a bug in the Arcadeflow website, now you can go here
https://zpaolo11x.github.io/Arcadeflow/history.html and download old versions from the old repository.
Then I'm looking into your attract.cfg, the first thing you need to change is:
startup_mode displays_menu
Arcadeflow should not be used with display menu startup mode, you should change this value to "default". You can run the displays menu at start changing options in Arcadeflow.
You also have this set:
menu_layout Arcade Flow 5.7
but for the same reason stated above, you should not set AF as menu layout, just leave this field empty.
Maybe this changes are enough to fix the issue... another thing I notice from your attract.cfg is that you have a lot of "collection" romlist like "last played", "console" etc. With the new database system AF is a bit picky for collection romlists: let's say you have a collection romlist that has games from multiple emulators. Everything will work fine only if there are also single romlist for each emulator. So if you have a "console" collection romlist with all games from SNES and Genesis, and you have SNES.cfg and Genesis.cfg, AF will be happy only if you have also the romlists SNES.txt and Genesis.txt. I know it's complicated, but working around this is even more complicated
Consider that AF already categorizes systems (console, computer ecc) automatically, and you can even enable "all games collections" in AF options menu. These are auto-updating collections for all games, latest played, favourite and system categories. The difference between AM collections and AF collections is that AF collections are "live": if you add a tag to a game in the SNES display, you'll see the same game starred in the "All Console Games" collection, or in the "Last Played" collection etc.