Jenkins pipeline starts every minute over and over again while it's still running

Jenkins
1

I have two repositories in gitlab first one with the main project, the second one with autotests. There is Jenkins pipeline, with the following configurations:
Build triggers:

Poll SCM Schedule: * * * * *

Definition: Pipeline script from SCM

SCM: Git

Repositories:

Repository URL: https://gitlab.com/App/Application.git

Credentials: Creds/******

Branches to build:

Branch Specifier (blank for ‘any’): */master

Repository browser: Auto

Script Path: pipelines/Jenkinsfile
The contents of Jenkinsfile:

try {
    node('Slave') {
        stage('Build') {
            dir('Backend') {
                git url: "https://$gitRepo", branch: 'master', credentialsId: gitlabCredentialsId

                def commitHash = sh(returnStdout: true, script: 'git rev-parse --short HEAD').trim()
                version = "${getDateTime()}-$commitHash"

                sh 'chmod +x gradlew && ./gradlew clean build --no-daemon'


                withCredentials([usernamePassword(credentialsId: gitlabCredentialsId,
                        passwordVariable: 'GITLAB_PASSWORD', usernameVariable: 'GITLAB_USERNAME')]) {
                    sh("docker login $registryName -u $GITLAB_USERNAME -p $GITLAB_PASSWORD")
                }

                docker.withRegistry("https://$registryName") {
                    def image = docker.build(imageName)
                    image.push(version)
                    image.push('latest')
                }
                sh 'docker system prune -af || true'
            }
        }

        stage('Integration tests') {
            dir('Autotests') {
                try {
                    url: "https://$autotestsGitRepo", branch: 'master', credentialsId: gitlabCredentialsId

                    withCredentials([usernamePassword(credentialsId: gitlabCredentialsId,
                            passwordVariable: 'GITLAB_PASSWORD', usernameVariable: 'GITLAB_USERNAME')]) {
                        sh("docker login $registryName -u $GITLAB_USERNAME -p $GITLAB_PASSWORD; docker-compose pull backend; docker-compose up -d")
                        waitUntilAppIsUp(localhost)
                        sh('./gradlew clean test')
                    }

                } finally {
                    sh("docker-compose down")
                    step([$class: 'JUnitResultArchiver', keepLongStdio: true, testResults: 'build/test-results/test/*.xml'])
                }
            }
        }

        stage('Staging deployment') {
            withCredentials([usernamePassword(credentialsId: gitlabCredentialsId,
                    passwordVariable: 'GITLAB_PASSWORD', usernameVariable: 'GITLAB_USERNAME')]) {
                sshagent(credentials: [sshInstanceCredentialsId]) {
                    dir('Backend') {
                        sh "scp -o StrictHostKeyChecking=no docker-compose.yml $instanceHost:"
                        sh "ssh -o StrictHostKeyChecking=no $instanceHost 'docker login $registryName -u $GITLAB_USERNAME -p $GITLAB_PASSWORD; docker-compose pull backend; docker-compose up -d'"
                        waitUntilAppIsUp(stagingHost)
                    }
                }
            }
        }
    }
} catch (e) {
    throw e
}

When I merge into the master of main Application project, pipeline starts in a minute and passes or fails one time as it should be. But when I merge into the master of Autotests repository, pipeline starts in a minute then it starts in a minute one more time then it starts in a minute over and over again while pipeline is still running. How to fix it?