Example displays three lines overlapping?

[Humancell]

Hello,

I found your library and wanted to use it as it seems much more efficient than the Adafruit libraries. When I try to run your example HelloOLED.ino, I am seeing the three lines displayed, but they appear to only be 2-3 pixels tall, and overlap each other. So I can see the top pixels of your company name, then the next line covering the rest, then only a few top pixels of the third line.

I'm using a 128x32 OLED display ... is there some other setting that I am missing?

[Humancell]

BTW ... I'm doing this on a ESP8266 using the ESP8266/Arduino board environment, and the Adafruit demos work perfectly on my display.