Submission of userinput Task of a Subprocess leads to Start the Parent Process in Appian

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PARENT PROCESS

Subprocess

After filling the User input task in this parent process it goes to Subprocess, In the Subprocess I have another user input task(Enabled Activity Chain), After filling the UserInput Task in SubProcess and Submitted, again this Parent Process is started as new one.

Note: In the UserInput Task of Subprocess I have a start process link which helps me to fill another form inside the userinput task of Subprocess.

Submission of StartProcessLink UI lead me to create this New parent process