Slide plays correctly on laptop but not on tablet/smartphone.

Good morning - I have a slide with pictures of about 15 musical instruments. When the student clicks on a picture of one of the instruments, the audio plays and a label pops up with the name of the instrument. There is an X on the label for the student to close out the label when desired. The label will also disappear and be replaced by a new label when the student selects a different instrument.

When I publish, this slide functions perfectly as intended on a laptop. However, when I try to play this slide on a tablet or phone, the X doesn't show up when the labels pop up, and for many of the instruments the label doesn't pop up at all. The audio still functions correctly on all the instruments. Why would the slide function differently on a tablet/phone than on the computer? Help. I would be happy to share the slide if it can be shared confidentially.

Thank you, 

Meg Lassiat