It looks a result of Out-Of-Sequence activities. P6 default calculation of relationship lag is based on "Predecessors Calendar" which can be change on Scheduling Options Calendar for scheduling relationship lag to:
1. Predecessors Activity Calendar
2. Successors Activity Calendar
3. 24hr Calendar
4. Project Default Calendar.
You can check which of this option is set on your Scheduling Options so you can identify what is pushing the activity and why? specialy on Out of Sequence conditions.
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It looks a result of Out-Of-Sequence activities. P6 default calculation of relationship lag is based on "Predecessors Calendar" which can be change on Scheduling Options Calendar for scheduling relationship lag to:
1. Predecessors Activity Calendar
2. Successors Activity Calendar
3. 24hr Calendar
4. Project Default Calendar.
You can check which of this option is set on your Scheduling Options so you can identify what is pushing the activity and why? specialy on Out of Sequence conditions.