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Perhaps its just a browser issue on your side. I currently could not reproduce the issue on my Form Builder.
Please try this procedure for intial troubleshooting.
#1 Close your browser and redo the login process to the Form Builder.
#2 Disable the Form Builder Autosave action.
User guide: How-to-Disable-Auto-Save
#3 Save manually : How-to-Save-a-Form
I already checked your form https://www.jotform.us/form/61375567009157 but I did not find any issue with it.
Hope this help. Let us know if you continue to have the issue.