PUT TILEMAP issue with colours (CPC)

[poppichicken]

hi Marco.

BITMAP ENABLE(160,200,16)
BORDER WHITE
CLS BLACK
DEFINE KEYBOARD ASYNC

tilemap:=LOAD TILEMAP("image/kenney-tiny-town-large.tmx")
PUT TILEMAP tilemap FROM 0,0

This displays part of the tilemap.

However something strange happens to the colours if I add another PUT TILEMAP.

tilemap:=LOAD TILEMAP("image/kenney-tiny-town-large.tmx")
PUT TILEMAP tilemap FROM 0,0
PUT TILEMAP tilemap FROM 0,0

And another causes graphical glitching:

tilemap:=LOAD TILEMAP("image/kenney-tiny-town-large.tmx")
PUT TILEMAP tilemap FROM 0,0
PUT TILEMAP tilemap FROM 0,0
PUT TILEMAP tilemap FROM 0,0

This causes a strange colour problem:

tilemap:=LOAD TILEMAP("image/kenney-tiny-town-large.tmx")
PUT TILEMAP tilemap FROM 0,0
PUT TILEMAP tilemap FROM 1,0
PUT TILEMAP tilemap FROM 2,0

This also causes a strange colour problem:
(Note that the x variable is not actually being used inside the FOR loop)

FOR x=0 TO 0
	tilemap:=LOAD TILEMAP("image/kenney-tiny-town-large.tmx")
	PUT TILEMAP tilemap FROM 0,0
NEXT x

Using the x inside the loop:
(And this runs much faster than the code above!)

FOR x=0 TO 0
	tilemap:=LOAD TILEMAP("image/kenney-tiny-town-large.tmx")
	PUT TILEMAP tilemap FROM x,0
NEXT x