Attackers might be trying to steal your information from (for example, passwords, messages, or credit cards). NET::ERR_CERT_COMMON_NAME_INVALID

I'm getting the following error for one specific website (and only one specific website):

I've tried the following:

• Making sure my time / data settings are correct
• Clearing all browsing data
• Deleting and reinstalling Chrome

Nothing works. Interestingly, I only get this error for one specific site (www.datacamp.com). And when I turn off wi-fi and tether my iPhone, I'm able to get through to the site. When I turn my wi-fi back on, I get errors again.

When I view details I see this:

And when I view the certificate I see this:

I've tried deleting the certificate, but I get the following message:

Any help is greatly appreciated!

Ok, I don't know why it took me so long to try this. I just unplugged my modem and router, then plugged them back in. At least for now, it seems to have resolved the issue...