Push-Pull

What?

Here was my train of thought:

1. Flat-plate: implies pushing
2. BUT inscription on plate says pull
3. Attempt to open door by pulling on flat-plate: impractical
4. Handle visible: implies pulling
( at this point Diane pulled the left-hand door open and beckoned me to follow )

Why is it even possible to buy a flat plate inscribed PULL? Makes no sense.

Oaklands Hotel, Laceby, Grimsby.