Pipeline script step looking script inside job@tmp path

[Mk]

I'm using Jenkins - 2.375.2 and both Jenkinsfile and script.sh files are in 
my github repository. 

My Jenkinsfile (Declarative Pipeline) content as follows,
pipeline {
    agent any

    stages {
        stage('Checkout') {
            steps {
                git url: 'g...@github.com:org/repository.git'
            }
        }
        
        stage('Script') {
            steps {
                sh 'script.sh' 
            }
        }
    } 

Any idea why my job goes to below path and looking for script? 
+ myscript.sh 
/home/user/jenkins/workspace/My_JOB_1@tmp/durable-942e10b9/script.sh: 1: 
/home/user/jenkins/workspace/My_JOB_1@tmp/durable-942e10b9/script.sh: 
myscript.sh: not found

I have my script inside this path /home/user/jenkins/workspace/My_JOB_1 
path. 
Not sure why it has created jobname with @tmp and looking script in that 
path.

Any advise to fix this problem would be helpful.

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