My form will not update correctly

I am using Gravity forms to make a list where by people select what state they live and and use conditional logic to let them then select what school they attend in that state. I have an excel spreadsheet of every school in every state. I got to California and there are 8,531 schools in the state and it would only allow me to update my form after 1,000, if i add any more it just reverts back to the amount I had before. Now whenever I make a new form, upload the 250 schools in Delaware it does the same thing and reverts back to my last update.

I continued to add states but just left the selections as Choice 1, 2, and 3 and go to Michigan and after that it won't keep any new drop down boxes after I update. Can anyone please help?!