on one of my K2 sites the add item screen is broken.
Joomla 3.6.4
K2 2.7.1

It looks like some of the CSS in not displaying correctly?

I think it may have started when a user was deleted.
I later used msql to assign all items with the deleted author to a new author.
UPDATE `XXXXXXXX_k2_items` SET created_by = XXX WHERE created_by = YYY

Any thoughts?
Thanks! -- Steven

Hello,

Most of the times this is related to a 3rd party K2 extension.
K2 Multi images is an extension known to cause this issue.

Hello, Steven.

You used two years old K2 Multi Images plugin with new K2 and in most cases it can cause a problem.

Please, try to update your plugin. You need to check and update all 3rd party extensions, after you updated your K2 (it is really needed after 2.7 release).