Android : What could produce the XML Layout file in notification bar?

I'm having a really weird problem.

I'm building an Android application which uses beacons to receive some notifications. The problem is that, besides the notifications that I should receive, I also get a notifications with the path to a XML file (not every time the same). In the code, there is nothing that could point to it.

Do you have any idea what could be the problem?

Also, a link with a screenshot: https://lh6.googleusercontent.com/eQc2MGW6Hi8lbt52QOXlCg2jZo340CGpOiHJsbvF-A77Kp5etggEzeVArRDd7_Wfk4tGhUCocN4zfrg=w1340-h555