iphone4g16gb

i have 8 channel zmodo sku 0865 dvr 9108v / 8 black color camera i install it work ok but look little strople line when zoom out is this issue normal , how come is not clear my tv out put 42 inch panasonic i was do for my friend 4 channel on his house quality look better than 8 channel how to solve it little line thread , thanks

is not clear view ? sometime popup line on each channel and strope ....