Sharepoint 2013 Workflow Task Process , Parallel for all User , Task Outcome Behaviour

This is by design, please read carefully the description: "Wait for all" completion criteria will return outcome that received the most number of responses.
It is unclear what you actually want to achieve so please choose one following
  1. If someone rejects the workflow stops and tasks in progress are cancelled. Set "Wait for first response", required outcome to "Reject", and default outcome to "Approved". Workflow will immediately stop if someone has rejected.
  2. If you want to wait for all responses and then if at least one rejected reject the workflow otherwise to approve, you should specify "Wait for percentage", "100%", "Approved", Default Outcome "Rejected". Workflow will collect all the responses.

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