Problem: same code submitted 5 times with different comments got different verdict on codeforces testing system: from accepted to tle. Link to original picture.

First group of equals submissions: 42063540, 42063549, 42063558, 42063574, 42063583

Second group of equals submissions: 42063251, 42063390, 42063403, 42063414, 42063421

You can compare the code and make sure it's the same, I'm scared and I do not know if it's possible in a real competition in codeforces rounds.

Is it dangerous to write comments to a solution in code? Can codeforces testing system works slowly if I wrote many comments?