It depends what types of foods you're eating. If you're not eating nutrient dense foods that nourish your body, then yes, eating the same foods day after day could hinder your weight loss. The human body requires an assortment of different vital nutrients that aren't available in every single food. In order to ensure we get all the nutrients our body needs, we should be eating a variety of foods.
Let's say you can't stand veggies, but will eat corn and carrots. Okay, corn and carrots do have some vitamins and nutrients, but not enough to keep a person healthy. For optimum HEALTH, a person should eat a variety of different foods.
Because we don't know anything about you or what you've been eating, we can't tell you for certain that what you've been eating has hindered your weight loss. Would you be willing to tell us a bit more about yourself and what you eat ? Could you tell us what a typical days' worth of meals would be ? Giving us more information would help us better answer your question.
But, it should be noted for optimum health (and by extension weight loss) a person should eat lots of these....