Captivate 8 Interaction click button help please

Hello

I have just started using captivate 8 for my training refreshers at work.  I seem to be getting to grips with most of the interactive side to this, however, I am struggling.  I have inserted a picture into the blank captivate slide and I have tried to get the click buttons to work when the slide is running.  It is for a hazard spotting exercise which will form part of a quiz for the delegates to complete.  I can get the boxes and the correct confirmation on the slide but there are about 11 of them.  when I run the slide I find that only 2 work and then the slide cuts off.  I have tried to move the timings and this has not worked.  I am sure there is a perfectly simple way to correct this however I cannot seem to find one.  I have been on youtube and google trying to see if I can locate an answer for this issue I have but drew a blank so far.

I am hoping someone can help me from this site.  I have had some training on the system but on basics.

thanks Julie