I've looked at the Instagram page you're referring to.  The spelling on the OpenStreetMap banner at the top of the page is correct.  The spelling error you're reporting is on the Instagram page itself rather than the map and is therefore out of the control of OpenStreetMap.  This is something someone has misspelled on Instagram.

https://www.instagram.com/explore/locations/1187270177951496/northleach-the-cotwolds/
