E-Paper 2.7" always display old text (can't clean)

Other Hardware Displays
1

Hi,
I have a Waveshare E-Paper 2.7" B&W with Waveshare Esp32 board.
In my code i have a initialise e-paper display function but its looks that if a fill all screan with white the screen won't clean from old text.
any idea why ?

void initDisplay() {
  display.init(115200);
  SPI.end();
  SPI.begin(13, 12, 14, 15);
  display.setFullWindow();
  display.firstPage();
  display.fillScreen(GxEPD_WHITE);
  display.fillScreen(GxEPD_WHITE);
  display.setPartialWindow(0, 0, display.width(), display.height());
  display.fillScreen(GxEPD_WHITE);
}
2

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