Weird dots in the screen that I can't find a way to get rid of
Hi there,
I have a document with 2 dots in the middle of the diagram that i cannot seem to get rid of. Please see the screen capture below:

1. Other files don't have it.
2. I cannot select or click it but when mouse over it, it shows somesort of icon (like it's showing positions or layout or something?).
3. When I move around the diagram, it moves too (e.g., it doesn't stay in a relative position within the diagram).
I've checked documentation and online but didn't find any information about this. Does anyone know what these are and how to get rid of it?
Thanks in advance.
