Why Does a Positive Charge q Seem to Lose Kinetic Energy in the Diagram?

[Miike012]

Look inside the paint doc.
My question is why does the paragraph say ...A positive charge q gains kinetic energy as it falls towards the negative plate...

However the graph shows that the positive charge q loses kinetic energy...

I am confused what am I not understanding?

 

[mathman]

"Falling" appears to mean going toward x = 0, i.e. going left in the graph.

 

[sophiecentaur]

I think the U and K labels are the wrong way round in the diagram if time is increasing to the right. K should be increasing and U should be decreasing if a charge starts at rest on one of the plates and accelerates to the other - which is what the written passage says.