In Acf Pro plugin i cannot add more than 470 rows.

I am doing a website in wordpress in which i have to insert more than 500 countries name. I am using a acf pro plugin for the repeter. But as all data was showing good but after the row 470 ,471 and up data are not showing. I insert the data update the page but the data gets invisible. I am poor in php. Plz help me experts in acf.Thank You.