Device status not updated when using the API

Welcome to the SmartThings Community, @viraptor!

The curious thing about OCF devices is that they work on a Plugin level (ST app) and not on an API level. This means that the status of those capabilities must be explicitly saved in the API by the developer of the device controller. Here’s more info about the communication of this kind of device:

Could you share the brand and model of the airPurifiers that you mentioned, please?