Thank you for uploading the JMatch file to my server and using it to create a HotPot activity in my Moodle 19 course.
I had a look at the activity, and I noticed that the file names for the missing pictures are for image files that do not exist. (see screen shot).
You can fix your JMatch exercise as follows:
- fix the "src" of the pastry image file
OLD: pain au chocolat.jpg
- fix the "src" of the chocolate drink image
OLD: hot chocolate.jpg
all the best