Tell us what you are trying to do?
I'm started to use Phil Buchanan's Accordion blocks, and although it seems it's translated correctly, the title header appears in english in the translated pages.
This is a test page. Original english: hidden link
Spanish translation: hidden link
I installed the Accordion Blocks plugin on my website so I can test it and see the issue. I can see that the title is not translated.
I also could see that the accordion text is nested inside the accordion block and this structure might not be compatible with WPML.
For now, you can use the top admin language switcher, when editing the page, and add the block manually to the translated page, just like you did on the original page.
I also asked my colleagues to have a look at this and see if there's any change we can make in order to make the translation added to the translation editor appear. I will give you a message back once one of my colleagues checks this out (which shouldn't take long).
then go back to the page where you have the accordion, update it, and update the translation. This time, you should see the title available for translation in a separate field. Please give this a try and tell me how it goes.
Just a note for others: update the original and then update the translation didn't solve it. I had to update the original, delete the translation, and then re-translate. Then it worked.