Uncertainty principle

Was just on a westbound train which apparently got lost in spacetime.
After leaving Paya Lebar, the train display and announcements claimed it was heading towards Simei.
At the next stop, the train system apparently decided that it was heading to Dover next.

(image has been edited to protect the privacy of the gentleman on the left)
A few stops later, it managed to partially rectify itself by announcing that it had reached City Hall - while it was still at Aljunied.
Eventually, the system apparently returned to normal around City Hall station.
So that's what they mean by a world-class transport system - you wonder where in the world you are!
I suppose I should be thankful the train didn't actually reverse direction and head back towards Simei into the face of the next train...