OLED 1.5" 128x128 SSD1351 SPI - strange supply current?

I am using this display in a design and the display is working great.

But I am really wondering, why the supply current is fluctuating between 16mA and 80mA constantly?
The PSU is a very stable design.
Peaks (current) may be higher.

The displayed "image" is not changed.

I have tested on Arduino Uno and Arduino Nano.
I have tested 2 pcs of displays.

All the same.
Do I have 2 displays - both defect or ?