This is my two W.A submissions for the problem 436B - Om Nom and Spiders

1. W.A on test 16: 6885624

2. W.A on test 21: 6885617

As you can see , on the 1st submission, I just deleted some lines in the 2nd one. But these lines shouldn't affect the output.

Is this a bug of codeforces' machines?