I'll say that it isn't that uncommon to have more strength in certain movements/planes of motion and their related variations. Since you are moving your body through the same space, but you are doing so with different muscles/levers and depending on your strength, limb lengths and muscle size/development (in this case comparing the relative strength of your biceps & back against your triceps & chest, not how muscular you look).
Does it really bother you? Or impact your life? If so, you can focus on training those areas and movements to overcome your perceived inbalances and weaknesses.