When routing, if I grab a via and move it, if the wire cross another via or wire, it does not trigger a DRC error. If I grab the wire and move it in the same way, it does trigger a DRC.
Here's screenshots for reference.
Grabbing the via, no DRC triggered on B2

Grabbing the B2 wire and dragging it, triggers the DRC error:

Chrome
69.0.3497.81
Windows
10