# PIC output is high before being set high automatically

I am creating a simple pic project that uses a PIC16F877A and I have noticed something that seems odd. Before using any code to change the state of the pins connected to port b, the port b pins are already high. Here is the code I am using in hi tech c with everything else removed to demonstrate the problem. I was wondering if it was normal for the pins to start high before being set in that state. If that is the case I could just set PORTB to 0 at first to solve the problem, I just wanted to make sure that nothing was wrong. This seems to be caused by the line TRISB = 0xFF but I can't understand why since that register only adjusts weather the pin is a input. If anyone requests it I can post my circuit diagram, however I was hoping to avoid having to draw schematic.

#include<htc.h>
#define _XTAL_FREQ 8000000
__CONFIG(UNPROTECT & PWRTDIS & WDTDIS & HS & LVPDIS);

int main()
{
TRISB = 0X00;

while(1)
{

}
}