Print returns empty but no errors

[tester_V]

Just found if I move the last "IF" block to the top of the "IF" blocks the script prints all lines just fine.
What does it mean?

with open('C:\\02\\en15\\TST2\\Debug_1.log','r') as ftor:
    for ln in ftor:
        #print (ln)
        ln = ln.rstrip()
        
        if program_n in ln :
            #print ("Start Time Line -->> " , str_t1)
            *extraWords,prg_n = ln.split('Name') # Grtting program name line #            
            prg_n=prg_n.replace('"','')
            #print ("Program Name -->> " ,prg_n)
        
        if start_tm in ln:
            
            *extraWords,st_t1 = ln.split('Time') # Grtting Start Time line #
            st_t1=st_t1.replace('"','')           
            #print ("Start Time Line -->> " , str_t)
            #print (type(st_t1))
            
        if end_tm in ln:
            #print (ln) 
            *extraWords,endt1 = ln.split('Time') # Grtting END Time line #
            endt1=endt1.replace('"','')
            #print ("ENd Time line -->> " , endt1)            

            
        if runtime_l in ln:
            #print (ln) 
            *extraWords,rnt_1 = ln.split('Time') # Grtting Run Time line #
            rnt_1=rnt_1.replace('"','')
            ftow.write (st_t1 +endt1 + rnt_1 + prg_n + '\n')  # works here#

            print ("All Lines -->> "+st_t1 +endt1 + rnt_1 + prg_n + '\n')  # does not work here #

ftow.close()