For some reason, the gold 50 coin doesn't get included in the score calculations. You can replicate this by starting up the game, clearing your game board and dragging a 50 gold piece onto your board, then clicking Get the Final Scores.

Edit: I did some digging and it seems like you didn't add a check for the fifty piece. I've fixed it in this pastebin if you want to grab the code, and I've attached a diff if you want to review it, though feel free to run your own diff to validate!

Source: https://pastebin.com/raw/Q54cMqw9
Diff: https://www.diffchecker.com/gdX6krrX

Weren't the players supposed to start with 1 coin of 20? (total 50) Or am I going crazy

Also, there should be a spot to place special orders, so the legal good shown is subtracted from the king's/queen's bonuses. (Page 13 from Merry Men's manual)
As it is, the Special Orders module isn't compatible with your scoring script.

you start with 2 20's instead of 1, and if someone has Arcane Scrolls, they still receive the King/Queen bonuses

Thank you all for your bug requests, as classes slow down again I will look into these and inform you if they have been fixed. This should be within a few weeks.