I don't know if it is of any help (I am no expert), but I noticed a few things:
- When I open the Card Image Generator, and the correct Fonts are not displayed, in the legend (bottom left) some symbols are displayed in upper case (usually they are in lower case). This is easily visible for the @ Symbol for Debt, which is an encircled "A" instead of "a" when it doesn't work properly.
- In Windows with the Chrome Browser, when I right click inside the generator (outside any text fields) and then go to "Inspect", in the following window near the top right corner, there is a red circle (with a cross and a 3 next to it). When I click on it, I get the following information:
Failed to load resource: the server responded with a status of 403 (Forbidden) etc...
The three failures are all related to Font types. The problem appears to be to load the required sources.