[2021] Caitlyn's hitbox moves when she leans forward to ult?

Jumping on top comment for visibility. :)

It's not hitbox related. Cait's hitbox doesn't move during her ult. The issue is vision related.

The platform tower's vision range is 1200 and it only attacks units directly in its vision. But its attack range appears to be 1250. Caitlyn R explicitly gives vision to all units on the enemy team during her R ("link vision", it's very different from regular perception bubbles).

By providing vision via her R, she's effectively letting the laser tower have that last 50 units of range if she's standing exactly in that in-between zone.