Doesn't save options properly

I’m changing the code for the Source link to have a target=”_blank” in the link, but when I go to save it, it does not save it. It will only save if I change the word Source to something like Original Source.. it saves the words Original Source, but never saves the target=”_blank” in the url part.

What am I doing wrong?

Everything else seems to work (other than, the fact that I can’t change the blockquote code either and have it save.

Trying to change:

<em><a href="%1$s">%2$s</a></em></p>

to

<em><a href="%1$s" target="_blank">%2$s</a></em></p>

Thanks so much!
Charles

https://ww.wp.xz.cn/plugins/press-this-extended/