If I select a folder from the Folders panel in Bridge ver 13.0.0.0562 and then select Purge Cache from the Tools menu, the cache will clear but the folders displayed in the Folders panel will start at the top instead of staying on the folder I selected.
The mentioned issue is fixed in the latest patch release #13.0.1.583. Please install and confirm if that fixes the issue. You can refer to the issues fixed in the patch at the following link https://helpx.adobe.com/bridge/kb/fixed-issues.html