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Did you modify the Adafruit_SSD1306.h file to match the resolution of your display? This might happen if the library thinks your display size is different.

/*=========================================================================
SSD1306 Displays

The driver is used in multiple displays (128x64, 128x32, etc.).
Select the appropriate display below to create an appropriately
sized framebuffer, etc.

SSD1306_128_64 128x64 pixel display

SSD1306_128_32 128x32 pixel display

SSD1306_96_16

-----------------------------------------------------------------------/
#define SSD1306_128_64
// #define SSD1306_128_32
// #define SSD1306_96_16
/
=========================================================================*/

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