As you can see, the 4MHZ is uncommented. If you convert the number to binary, it doesn't match the osccon bits in the datasheet when you select 4MHZ. Same with the reverse, select the 4MHZ bits in the datasheet, convert to decimal and it doesn't match the table. Yet, the numbers in the table do work.

'osccon values for 16f818/819:
'OSCCON = $00 'for 31.25 khz
'OSCCON = $10 '125khz
'OSCCON = $20 '250khz
'OSCCON = $30 '500khz
'OSCCON = $40 '1mhz
'OSCCON = $50 '2mhz
OSCCON = $60 '4mhz 'set int osc to 4mhz
'OSCCON = $70 '8mhz