Bugs in content types

H5P may work find with one browser, on one OS, at one time, but not work at all on another browser, on another OS, at another time. At least, that has been my experience, and the experience of others - from what I have been reading.

I put together an H5P dialog card lesson on bird identification. You can - maybe - see it here. 

https://nuclix.net/

Just go down to the bottom, and click on the "Bird Identification" link.

I have created interaction using question set. but the interaction is not working on the inserted page. Even I tried to upload question set created on this site (h5p) to my site, that too is not working. Please see screenshot 

When I inititally installed H5P in Wordpress, the default font was a sans serif font. After some time, it changed into a tiny serif font. TYhis is especially bad with the dialgo cards which I use as voocabulary cards. They contain one word which is so tiny one can hardly read it. The wysiwyg editor has no option changing font size or style. The editor's style option does not function either. 

Amy idea how to fix it? Many thanks,