That's strange. Attempting to connect to the .com on my normal ISP results in a reset connection error, but accessing it via my current VPN provider allows for the request to go through. Same goes for wifi (same ISP) vs. mobile data on my phone.
I didn't really think about trying different modes of access when testing the .com in my last post. It's just me, then.
Never heard of anything similar to this yet. It sounds indeed very strange. Maybe it's a cache problem, try flush DNS cache.