That's a great clue!
The JavaScript validations are working without any issues when the script is played back without any load applied.
Given that the JavaScript validations work perfectly when played back without load, it's likely that the issue is related to the load testing environment or the way the load is being applied.
LoadNinja might be using a different JavaScript engine or version than the one used during playback without load. Confirm that the load testing tool's JavaScript engine is compatible with your script
LoadNinja might be using browser emulation to simulate user interactions.
Hope this helps - Happy to help further!!
Thank you very much and have a great one!
Warm regards
