To reproduce:
1) Open the attached project and 8.AllDone scene
2) Make sure your layout has both Console and Hierarchy open and visible
3) Also, make sure Console clears on play (for clarity)
4) Play the scene
5) Click the top entry (about initializing inventory)
6) Hover the mouse around the console

Expected: Nothing happens
Actual: There's also animation as if you're hovering over hierarchy elements. It doesn't last very long, but re-clicking the message causes the issue to happen again

Reproduced in 2018.3.0b2, 2018.3.0f2, 2019.1.0b5, 2019.2.0a6
Not reproduced in 2018.2.20f1

Not reproduced in Win 10