Details
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    Type:Bug 
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    Status: Done/Fixed
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    Priority:Major 
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    Resolution: Won't Fix
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    Affects Version/s: 2.1
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    Fix Version/s: 2.2.3
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    Component/s: Core CiviCRM
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    Labels:None
Description
In 2.1, to replicate:
1. Edit existing activity
2. Add new activity - it overwrites previously edited one.
This might be specific to HRD installation and customisations.
In general it seems like adding activity need to go through CRM_Contact_Page_View_Activity class in order to function properly (civicrm/contact/view/activity?action=add url is being used) If adding goes directly to civicrm/activity?action=add (CRM_Activity_Form_Activity), overwriting happens.
Verify if it doesn't happen in 2.2