As he title says, i do shake em up with calcium though but they've been in a bag with other dead crickets.
No, that is fine. I keep my crickets alive with carrots. It works really well for food and water. I would hate to have to buy crickets everyday.
It shouldn't cause a problem, however you need to make sure that you are gutloading your crickets before feeding them to your reptiles, and also dust them with a calcium vitamin supplement. Crickets are basically just a shell, so for your reptile to get nutrients from them its up to you to feed or 'load' the cricket up with good food and nutrients so they will get passed on to your reptile. Dusting with calcium is also a MUST. If you don't, your reptiles may have issues with their bones down the road.
