Woo-Hoo. You have a GalaxyCore GC9106.
I have found a GC9106 datasheet. It is a 128x160 controller which explains why the offsets are different on a ST7735S 132x162 controller.
I will study the datasheet in the morning. The GC9102 is a bit crap compared to Sitronix. The GC9106 seems to have some improvements.
It seems odd that they print ST7735S on the pcb when they must know that the panel contains a GC9106 !!
David.