Hmm..
I have write a Java solution and submit it.
It seems no error in the tests.
Made some changes in the random tests:

1. Added "Testing for candies = [...]" 
2. Added "Expected: [...], instead got: [...]" when testcase failed.

Some possible problem in your code(just guess):

1:
When candies = [single integer]
your code should return [0,n], instead of [1,n]
2:
don't modify the input array.

Can you paste your code here and mark it as having spoiler content?

Ah, sorry. I haven't seen your reply :(
It seems that you are using JAVA?
I copied this testcase to the fix test, it returns {78,20}
I think the JAVA translation mey contains errors, but I don't know JAVA.
Let me try, or waiting for @theropodMusings to check it.
Thanks for your feedback ;-)

Thanks -- I'm glad you enjoyed it and that you figured out the problem!

On one hand there have been 91 successful Java completions so far, so I assume the random tests are OK, but on the other hand bugs can always turn up. Do you want to try posting your solution as a reply, and then marking it as a spoiler, and I can take a look at it? (I haven't asked anyone to do that before, but I would think that as the kata author I should be able to see comments marked as spoilers.)

Hi! What language are you using?

Are you sure that your result is right?
Please give me the input data, thanks ;-)