An empty Dynamic album keeps popping up

Piwigo 2.9.1
Operating system: Linux
PHP: 5.4.45 (Show info) [2017-08-16 15:08:17]
MySQL: 5.5.5-10.1.25-MariaDB [2017-08-16 15:08:17]
Graphics Library: GD bundled (2.1.0 compatible)

I am trying to find out why I get an empty dynamic album every now and then, seems like some kind of copy of my own User album, but empty. I can delete it an no issues, but it pops up again after a little time.

Have looked for old tags and other things that could have been associated to it, but find nothing.