You have a bug in your code. Double check for invisible characters.

There should be no trailing white space at the end of each line, or new line characters at the end of the string.

@joshrainwater that's not an issue as it doesn't affect the test outcome and is just the character not rendering properly on the site. However, to get rid of the confusion I reduced the dimension for that test case so it renders correctly.

I've noticed in my test output, in the sample, there are a couple undefined characters mixed in the sample output somehow on the longer test that makes it fail.

■ □ ■ ��� ■ □ ■

Maybe that's causing issues? Is it a Unicode issue here as well maybe?

Sure, can you post it in a spoiler comment please?

I have made some improvements to the test feedback. Can you try again?