Does being double jointed in both your elbows and your shoulders effect how well you can bench press?

I don't know: After performing a literature search, i found no studies that looked at the effect of being double jointed on bench press. I did find one study that noted significant decreased strength in women with a particularly bad form of ligamentous laxity, ehlers-danlos, but i'm not sure we can extrapolate. Either way, consistent effort with good form will result in gains in strength. Good luck & work hard.