There are several threads covering this. Many are having issues and many are not. A lot seems to depend on whether you updated to the 'New Homekit Architecture' in the Home app. It caused a lot of problems and Apple withdrew it, but those who already updated are stuck with it.
In general just make sure you have the 'relaxed pairing' option selected in the Hubitat Homekit integration.
And please keep in mind that the Homekit app is a public beta. It could be sometime before it's working for everyone with issues ironed out.
