player characters and titans are elongated and i cant see my gun

So i am having a problem with running titanfall. when i play my character doesnt have his gun, and then when i start shooting it, the pieces of the gun become elongated all over the screen, often blacking out my screen. 

i am running windows 7 on a mac via bootcamp. im on a 13 inch macbook pro retina. i talked to someone and he said that i need to match the screen resolutions or something like that but i am not very tech savy. i know my laptop may not be kick ass, but i want to know what to do so i can play this game. the game runs smooth when i play, but the guns and character models become stretchy and elongated and impossible to work with. any help or ideas to get me in on the action that would be awesomesauce! thanks, please help!

some basic specs are these: Processor: 3 GHz intel core i7 Memory: 2, 4 GB 1600MHz DDR3 (8GB total) Display: 13 inch (2560-1600) Intel HD Graphics 4000 1024 MB graphics