Page Size dropdown has extra characters

[jcicero518]

Looking at https://react-component.github.io/pagination/?path=/story/rc-pagination--sizer and then attempting to implement the "sizer" in my code. When I enable showSizeChanger, each select option appears to have (Chinese?) characters after it. However I changed the locale prop to "en_US" so now it just has "undefined" after each number.

See screen shot:

The "sizer" only appears to work with rc-select, but this happens. How do I get rid of the undefined?

Example of what it looks like in Chrome Components:

Thanks.