In today's contest Codeforces Round 1070 (Div. 2), when I submitted the code for 2176D - Fibonacci Paths, the codeforces website got stuck loading after pressing the submit button and then gave a 404 error, and gave a broken site error after reloading. So, I had m1.codeforces.com open in another tab and submitted the exact same code.
Now, this ended up counting as 2 submissions and my first submission got skipped. Can something be done about this MikeMirzayanov ?
In the attached screenshot it can be seen both the submissions were at the exact same time. 
is it that bad ?
Resubmitting in a contest will result in 50 fewer points.
You can click the "Ask a question" link and ask them to skip your later submission. But I am not sure if this works after the contest.
That is exactly why the first submission is skipped. It doesn’t count towards any possible penalty. This is only an issue if your first submission isn’t skipped.
This generally does happen many times when codeforces is in heavy load, but if it is skipped correctly nothing to worry about.
I think it does. This submission was done the exact minute (00:50) as the OP, but got 1600 points, while OP got 1550 points only. 50 points were deducted due to resubmitting.
Ok you are right, sorry for that. Every time I encountered that I just assumed it doesn’t cost penalty without checking (I think I encountered this at least 5 times). That sounds like a pretty serious bug to me.
I also know that in contest managements, rejecting solutions and skipping solution are two different buttons, I was expecting rejecting solution costs penalty and skipping does not.