Not an issue. Your solution probably runs into an infinite loop, and you can print the inputs.

I also have the same result. I have no idea where it is getting the extra 1 from? So strange...

In IRB mine works perfectly...

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Post on the "snail" discourse page and also post your code (since I can't help you without it).

Print the input parameter to the console to see where you went wrong - e.g. Javascript -> console.log(coordinates).

It's hard to determine the problem without seeing your code. So if you post it to a reply to this comment I can help you.