Hi MikeMirzayanov, reporting a bug from before, that was rectified.

I tried submitting problem (275A) today. Yesterday, I used Safari. It was working perfectly fine.

Today, I clicked on Submit first time — no response. Clicked on Submit second time — says You have submitted exactly the same code before.

I changed browsers from Safari to Brave, same behaviour. I changed to another problem to test it — still the same behaviour.

On inspecting, it logs 403 - Forbidden for /data/problemLock?rv=0vsb5soa1:1. This log is happening even for successful submissions.