Fixing it
When a site is blocked that should not be.
On your iPhone
On the block page, tap Wrong?. That opens the site for you for 24 hours straight away and tells us to look at it, so you are not waiting on a reply to get on with your day.
In Chrome
Open the site, click the Bramble mark, choose Report this site… and then Flag this domain. It goes to the review queue. The same steps report a site that should have been blocked and was not. This needs the browser to be paired first, and pairing is here.