The description for Equipment in element info dialog is generated as below rule, the highlighted part can be multiple if have different component/nodes: "Class" + "Manufacturer" + "Component count" + "x" + "Material description"
The only thing which could be edited in ("Class" + "Manufacturer" + "Component count" + "x" + "Material description") is the Material description by making changes to the equipment’s DNA file.
If you want to edit the Description of the equipment directly from the Element Properties, you can follow this article.
If above problem still persists, then please create a Service Request and contact the Bentley Product Advantage group. Please include a list of all relevant details to get in depth analysis for a solution or workaround.
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