I am trying to withdraw funds for several weeks. But when I try to open the site it shows to me like the mentioned images. I think it is happening only to me as I could not find out any post like this.

Same here.
Site is down and we are waiting for official announcement from team. It was expected to get an announcement today because Hhampuz has talked to someone.
But whirlwind money devs did not reply here so far.
We are still waiting for official announcement and site to be fixed.
I got an email back from whirlwind just now and it was as I suspected - something happened.
Basically, main people lost access due to travels while people still with access didn't have the right credentials to solve basic issues that caused withdraws to get stuck on the back-end. I've been assured that nothing has been lost and that all will be taken care of tomorrow meaning all currently pending withdraws will be processed and things return back to normal. It was an unfortunate situation is all!
I've asked my contact at whirlwind to reply in this thread whenever they can with further details, so from now until then/tomorrow night there is no need to panic even if I wouldn't recommend you to deposit until the backlog is cleared. Campaign participants will also be paid out as per usual tomorrow, regardless of if you've removed your signature or not.