What?

I first made a easy program that only made RB1 "blink" and I compiled it and transfered it over..

Then I made this code and when I compiled it the hex file still had the old easy program.

Code:
@   device  pic16F648A, hs_osc, wdt_on, mclr_on, lvp_off, protect_off
DEFINE OSC 20
        
loop:   

        high portb.0
        pause 250
        High portb.1
        pause 250
        high portb.2
        pause 250
        low portb.0
        pause 250
        low portb.1
        pause 250
        low portb.2
        pause 250
        goto loop
        
        
        
        end

So the Problem is: if I change the source code and compile it doesnt update the hex file.