Without trying to understand what your program attempts to do, I noticed a couple of errors which are completely fatal so that this simply cannot work at all:

1. you must pop registers in the opposite order than you have pushed them
   
2. you must pop the same amount of data than you have pushed
   
3. you must return from an ISR using RETI rather than RET
   
4. it is a poor programming practice to have multiple exits from an ISR (can lead easily to errors)
   
5. there is no reason to modify a variable if you then restore it from the stack (detik and r7 in the timer isr)
   

JW