Form displaying error message resulting multiple submissions

We continue to get this error after submitting any of our forms. The forms are going through, but people think they are not going through so they continue to submit them multiple times.

I cannot upload the screen shot of the error but it says:

Pedido cargado EXITOSAMENTE!

Su pedido ha sido cargado con exito.

I have tried submitting the form and see that the same message is displayed. However, when I translated the message, it indicates that 'Order loaded SUCCESSFULLY! Your order has been successfully loaded'. 

You may change this message by editing the Thank you page. 

Hope this information helps!