Ah, I see what you've done here - let me help you correct it ;-)
As you suspect, your answers (reading across the rows) are all incorrect. How can we tell this? Because...
...there is a way to choose a synonym of each of your answers so that the word spelled out in a row uses some arrangement of all the letters of the row above plus one additional letter - which would surely be the intended puzzle mechanism!
Without knowing the original clues you had to work with, we can still solve this by looking for appropriate synonyms of the words you have inputted.
If you do this correctly you should get the following output, which satisfies the puzzle's in-built mechanism: