Opacity on drag & drop text not working

I have a drag and drop activity with an image that users drag words on to. It is all working fine except that when I change the opacity of the draggable text to zero, the opacity stays the same. It looks fine when I am editing it, but when I view the activity the opacity has not changed. Any suggestions for where I might be going wrong? I have attached three images showing the settings are at 0 opacity, the screenshot showing how this looks in edit mode, and the screenshot showing how it looks in view mode.

Summary: 
Opacity changes not working
Content types: 
BV52's picture

Hi nikkimacfarlane,

Do you have a link to you content? This is working when I tried to reproduce it: https://bv-demo.h5p.com/content/1292421831529889399

-BV