JPY Currency Error

I am from Japan.

There is an error in paypal payment in Japanese Currecy in yen.

settings in WP

http://raku27.net/error_member/001.jpg

1 JPY = OK

10 JPY = OK

100 JPY = OK

1000 JPY, the number returns to 1 in Paypal page.

http://raku27.net/error_member/002.jpg

Are there any resrictions when more than 1000 in price setting?