strange custom tag

hello

first : thank you for developping for WP
but using your plugin I meet an issue
the field for the custom tag refuses the normal end of the declaration.
if I write …content=’something’> it will erase the content and display nothing. in order to have the word(s) displayed I have to write …content=’something
without the end and then it will display : <meta name=’custom’ content=’something
no closing quote, no closing arrow

would you please fix this
or could it be a plugin conflict ?

thanks

http://ww.wp.xz.cn/extend/plugins/head-meta-data/