Apparently, Tumblr is now adding that “+ Upload Photo” link to asks, so there are double links when answering asks if you are using XKit.

This feature will be removed as soon as possible, via Automatic Updates.

In the meanwhile, if you are impatient, you can turn it off by:

1. Click on the X icon then Manage Extensions
2. Select Fix and Tweaks, then Change the Settings of This Extension
3. Turn off “Tweak inbox to enable file uploading to ask replies”

Thank you for your patience.