Drag & drop xAPI statement

I have set up an H5P drag and drop exercise using the WP plugin. I also have H5P xAPI plugin and H5PxAPIkatchu installed. I am connecting to Watershed and the connection is good. However the drag and drop exercise does not seem to be generating any statements when the Check button is clicked. How can I ensure the statements are produced, and either transfer to Watershed OR display in H5P results on the WP backend?

Thanks