HTML5 file doesn't show properly on website due to css class

Hello,

I have published short versions of my storyline training modules on my website through an iframe. Until now, I had never experienced any problem with them. But since yesterday, one of my training doesn't show properly ( instead of fitting in the frame, it is much larger and people need to scroll to see the entire module). 

I have examined the html file of all training, and I do see a difference. I see that this particular training has as CS class the tags "cs-HTML is-theme-classic is-desktop is-too-tall is-too-wide ". All the other modules, which did fit on my website had the tag "cs-HTML is-theme-classic is-desktop no-seek". I guess this must be due to an option in my storyline file that was changed, or an option during the publication, but I cannot find which one. 

Could you tell me to what these different tags refer, and how and where I can change my file so that it takes the same tags as my older modules? (That way the module can fit on my website again).

Thank you very much for your help.