tengo un formulario y me marca error Only one entry is allowed

tengo un formulario y Formulario Contigencia IT - Jotform Form Builder y marca el siguiente error, me marca error Only one entry is allowed no se como solucionarlo.

Hi Mauricio,

Our Portuguese Support agents are busy helping other Jotform users right now, so I'll try to help you in English using Google Translate, but you can reply in whichever language you feel comfortable using. Or, if you'd rather have support in Portuguese, let us know and we can have them do that. But, it might take a while until they're available again.

Now, coming back to your question, I have cloned and tested your form, and I was able to submit twice and the error "Only one entry is allowed "is not showing. I also cleared the form cache on your form in our end to help minimize the errors caused by the piled-up cache in your forms. Check out the screencast below to see my results: 

Can you take a screenshot of what’s happening and send it to us? We’ve got a guide here that’ll show you how to do that.

Once we hear back from you, we'll be able to move forward with a solution.