I run H5P on Wordpress. On my server, I enable WAF 6G. So far, the problem I encounter is the search box in the All H5P content 'fail to load data'. There is no problem when the WAF 6G is turned off.
I noticed this error in Drag and drop Papi Joe but tested it in the regular Drag and Drop (the number below are from the regular D&D) didn't test it in more activities but I suspect it will be the same.
Basically the size I give to my activity is not the display size.
Giving Size: 620x310 in the activity results in a 958x624 size when putting out the embedded cod
Giving Size: 958x624 in the activity results in a 958x765 size when putting out the embedded cod