Hello again 
,
your MULTI_STATE_BOX has the ID → “statebox1” !!!
Your CODE is searchig for a MULTI-STATE-BOX with the ID “readMoreStatebox” !
And what is happening with your buttons, i do not know, because i can’t see them on the pic.
But i assume they also have the wrong ID (surelly calles “button1” or something like that)
To be more informed, you can also hover over the 4-little red buttons which shows you the error-lines. Hover over them and take a look, what they are trying to tell you.
How to work with “multi-state-boxes” you will see here…
https://russian-dima.wixsite.com/meinewebsite/multistate-boxes
And how to work with some button-actions here…
https://russian-dima.wixsite.com/meinewebsite/working-with-buttons