Hi @stefanz112,
I hope you are doing well today!
There is no known issue or reported bug related to this. Please try enabling Load form using AJAX and Prevent page caching on form pages options under Edit Form->Behavior->Rendering
https://wpmudev.com/docs/wpmu-dev-plugins/forminator/#rendering
If the issue persists, please share an export of the form and the link to the form page with us, so that we can check further.
You can find more info on how to export the form here : https://wpmudev.com/docs/wpmu-dev-plugins/forminator/#import-export
After exporting, please share the code using a service such as https://pastebin.com which is free to use.
Please always make sure to use such service to share the code and don’t post the code here directly as it will most likely be unusable.
Kind regards,
Zafer