Could not click the "OK" while subscribe RSS feed

While I prepared to subscribe a RSS feed, I found that the "OK" label couldn't be clicked.
And I change other feed, all of them are wrong. I thought whether the question is caused by the zotero version. Then I update it from 7.02 to 7.07. But it not works.

https://s3.amazonaws.com/zotero.org/images/forums/u12876649/uht8nwjt66cd9n8yp70b.png
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