y am i walking on walls?

i have 2 questions:
1. y am i walking on the walls
2. y can't i jump every time i press space

if anybody could answer those that would be great
thanks, Rubiks14

; set up the graphics
Graphics3D 800,600
;set up the back buffer
SetBuffer BackBuffer()

; some globals
Global PlayerGrav# = 0.0
Global Grav# = 0.2
Global jumped = 0
; collision groups
Global PLAYER = 1
Global SCENERY = 2

; create a light
AmbientLight 255,255,255

; create a camera
Global camera = CreateCamera()
; give the camera a distance
CameraRange camera,1,600
; give the camera the same type as the pivot
EntityType camera,PLAYER

; create a pivot for the camera
Global camera_pivot = CreatePivot()
; give a radius to the pivot
EntityRadius camera_pivot,7.5
; make a type for the piivot
EntityType camera_pivot,PLAYER
; move the player to the middle of the map
PositionEntity camera_pivot,10,0,10

; load the level
Global level = LoadMesh("my little map.x")
ScaleEntity level,20,20,20
EntityType level,SCENERY

; load the gun mesh
Global gun = LoadMesh("gloc.3ds",camera)
; load the gun texture
weapon_tex2 = LoadTexture("glocmap.jpg")
; texture the gun
EntityTexture gun,weapon_tex2
; rotate the gun
RotateEntity gun,12,170,14
; scale the gun
ScaleEntity gun,0.01,0.01,0.01
; position the gun a little behind the camera
PositionEntity gun,1,-1,1.5
; draw the gun last
EntityOrder gun, -1

; collisions
Collisions PLAYER,SCENERY,2,3
Collisions SCENERY,PLAYER,2,3

; main loop
While Not KeyHit(1)


MovePlayer()
TurnPlayer()

; the player is moving down
PlayerGrav# = PlayerGrav# - Grav#
	
; give gravity to the level
If EntityCollided(camera_pivot,SCENERY)
	; player gravity is 0
	PlayerGrav# = 0.0
	; player not jumping
	jumped = 0
EndIf
	
; position the camera with the pivot
PositionEntity camera,EntityX#(camera_pivot),EntityY#(camera_pivot),EntityZ#(camera_pivot)

; move the camera to current gravity force
TranslateEntity camera_pivot,0,PlayerGrav#,0

; update the world	
UpdateWorld
; draw the world
RenderWorld
; flip the buffers
Flip
; end of main loop
Wend
; end of program
End

Function MovePlayer()

; move the player foward when player presses w
If KeyDown(17) Then MoveEntity camera_pivot,0,0,2
; move the player back when player presses s
If KeyDown(31) Then MoveEntity camera_pivot,0,0,-1
; move the player left when player presses a
If KeyDown(30) Then MoveEntity camera_pivot,-2,0,0
; move the player right when player presses d
If KeyDown(32) Then MoveEntity camera_pivot,2,0,0
; make the player jump if player presses space
If KeyHit(57) And jumped = 0
	; make the player jump
	PlayerGrav# = 3
	; the player has jumped
	jumped = 1
EndIf

End Function

Function TurnPlayer()

; turn the player with the mouse
TurnEntity camera_pivot,0,-MouseXSpeed(),0
; make the player look up and down
TurnEntity camera,MouseYSpeed(),0,0
; z roll correction
RotateEntity camera_pivot,EntityPitch#(camera_pivot),EntityYaw#(camera_pivot),0
; z roll correction
RotateEntity camera,EntityPitch#(camera),EntityYaw#(camera_pivot),0
; move the mouse to the center of the screen
MoveMouse GraphicsWidth()/2,GraphicsHeight()/2

End Function