Jenkins started 2 Pipeline at same time

Hi , I am facing issue in which when i press button to build pipeline, it will start 2 pipeline at the same time, previously this issue was not there.

Can you share your Jenkinsfile/pipeline script (redacted from any secure information)? Do you have a trigger specified in your Jenkinsfile that could possibly be triggered by starting the job manually? What does the build cause say for the second job that is started? Basically, we would need a lot more information to be able to help you.