I'm experiencing problems if I define lots of variables; it looks like they override each other.

example:

A var byte
B var byte

A = 1

then the value of A = 1 but B gets 1 to how is this possible? do I have to give all of my variables a memory location my self?

here are al my variables:

Code:
LightButton1 VAR PORTB.7
LightButton2 VAR PORTB.6
LightButton3 VAR PORTB.5
LightButton4 VAR PORTB.4
LightButton5 VAR PORTA.5
LightButton6 VAR PORTB.2
LightButton7 VAR PORTB.1
LightButton8 VAR PORTB.0

MenuButton VAR PORTC.0
BackButton VAR PORTC.1

RotaryL VAR PORTC.2
RotaryR VAR PORTC.3

Relay1 VAR PORTC.4
Relay2 VAR PORTC.5
Relay3 VAR PORTC.6
'Relay3 VAR PORTC.5 ' temporarly for debugging
Relay4 VAR PORTD.6
Relay5 VAR PORTD.0
Relay6 VAR PORTD.1
Relay7 VAR PORTD.2
Relay8 VAR PORTD.3
Relay9 VAR PORTD.4 'Heater
Relay10 VAR PORTD.5 'Co2 pump
Relay11 VAR PORTD.7 'Co2 refresh

'SET I or O

Input LightButton1
Input LightButton2
Input LightButton3
Input LightButton4
Input LightButton5
Input LightButton6
Input LightButton7
Input LightButton8
Input MenuButton
Input BackButton
Input RotaryR
Input RotaryL

Output Relay1
Output Relay2
Output Relay3
Output Relay4
Output Relay5
Output Relay6
Output Relay7
Output Relay8
Output Relay9
Output Relay10
Output Relay11

'DCFSignal needs to be connected to the hardware serialport (portc.7)

DQ VAR PORTE.0 ' Alias DS1820 data pin
DQ_DIR VAR TRISE.0 ' Alias DS1820 data direction pin
Temp2 VAR WORD
TempSensor VAR BIT ' if 0 then no sensor where found.


'Variables

'Byte0 define's repeat or not 1 = repeat
'Byte1 define's the maximum
'Byte2 define's the minimum
'Byte3 is the variable byte
'Byte4 return 1 if it was rotated
RotarySetting VAR BYTE[4] bank0


'all bytes after each other, byte 0 to 2 are the start 
'timings BYTE 3 to 5 are Stop timings and byte 6 is the mode
' mode 2 = start/stop @time
' mode 1 = aan
' mode 0 = uit
LightSetting VAR BYTE[56]


'byte 1 to 3 is the last date un witch it has refreshed
' if byte4 = 0 then do never refresh
' if byte4 = 1 then weekly refresh
' if byte4 = 2 then monthly refresh
' if byte4 = 3 then yearly refresh
Co2RefreshSettings VAR BYTE[4]


'byte 0 to 2 are the date and byte 13 to 15 are the time bytes on witch it has to stop. 
' byte3 = Duration
' byte4 = Repeat
' if byte4 = 0 then pump evry halfhour
' if byte4 = 1 then pump evry hour
' if byte4 = 2 then every 12 hours
' if byte4 = 3 then every day
' if byte5 = duration time in minutes
'byte6 = the state, 0 = off, 1 = on, 2 = interval 
'byte7 to 12 is the next time that it has to run
Co2PumpSettings VAR BYTE[16]


'Byte1 = the temprature, byte2 = halfdecimals, byte3 = heaterstate 0 = do not heat 1 = heat 
HeaterSettings VAR BYTE[4]
HeaterState VAR WORD[3] 'Byte1 = currend temp, byte2 = currendtemp half decimals, byte3 = state 1 = heating 2 = off

TimeDate VAR BYTE[7]
I VAR BYTE
A VAR BYTE
B VAR BYTE
Temp VAR BYTE
MenuSubMode VAR BYTE
Dender VAR BYTE[4]
DCFSignal VAR BIT

TempTime VAR BYTE[7]
MonthDays VAR BYTE[13]

'define maximum nummer of days is the month

MonthDays(1) = 31
MonthDays(2) = 29
MonthDays(3) = 31
MonthDays(4) = 30
MonthDays(5) = 31
MonthDays(6) = 30
MonthDays(7) = 31
MonthDays(8) = 31
MonthDays(9) = 30
MonthDays(10) = 31
MonthDays(11) = 30
MonthDays(12) = 31

' if 0 then status screen (main) is showed
' if 1 then mainmenu is showed
' if 2 then lightmenu1 is showed
' if 3 then lightmenu2 is showed
' if 4 then lightmenu3 is showed
' if 5 then lightmenu4 is showed
' if 6 then lightmenu5 is showed
' if 7 then lightmenu6 is showed
' if 8 then lightmenu7 is showed
' if 9 then lightmenu8 is showed

Mode VAR BYTE
Flash VAR BYTE
Flash2 VAR BYTE
CFlash VAR BYTE
ArrowPlace VAR BYTE bank0

Command VAR BYTE ' Storage for command