It's hard to say without knowing what recipe you use and how it looks when you pull it from the oven. My first thought though would be that it's underbaked.
Amber
Are they falling right when you take them out of the oven? They might be underbaked. You have to be very careful about not opening the oven too soon. If you do it could fall in the center. When I go to check mine I usually just open the oven as little as possible and I will just tap the oven rack a little to see if I can see the cake "jiggling" in the center. If so I shut the oven immediately and give it a few more minutes. If it doesnt seem to jiggle, then I slide the oven rack out only slightly and check with a toothpick. Try to keep it in the oven as much as possible until you are SURE it is done. I have lost a few cakes by getting them out too soon. Otherwise maybe there is a problem with your recipe??
i recently made a few dozen of cupcakes...i discovered that the first batch, the middle sunk..the rest were ok...conclusion: eventhough i preheated it enough, it is possible the oven is not hot enough..so, underbaking is my probable answer too..
I use the same recipe except that I use butter instead of oil and milk instead of water, but I find that it does take longer to bake than just a plain cake mix. You might just want to try baking it a little longer and checking it VERY CAREFULLY!
I dont think a hand mixer would be the problem. Excessive Overbeating could be your problem, but cake mixes are generally pretty forgiving. I usually just mix on low for 1 minute and medium for 2 minutes. you can also thunk your pan (after youve filled with batter) on the counter several times to break up some of the air bubbles. Also make sure that you are putting the proper amount of batter in the pans and that your oven isnt running too cool.
I dont think a hand mixer would be the problem. Excessive Overbeating could be your problem, but cake mixes are generally pretty forgiving. I usually just mix on low for 1 minute and medium for 2 minutes. you can also thunk your pan (after youve filled with batter) on the counter several times to break up some of the air bubbles. Also make sure that you are putting the proper amount of batter in the pans and that your oven isnt running too cool.
After I prepared the extender, I added it to the batter and mixed everything together, then I poured it into the pan which was not full, but again a did pour everything into my 9X13 pan.
I guess I am not sure what you mean...do you mix the cake mix and the "extra" stuff seperately? You can just mix them all up at once if that is what you are saying....
I guess I am not sure what you mean...do you mix the cake mix and the "extra" stuff seperately? You can just mix them all up at once if that is what you are saying....
I mix the extra stuff seperately then then add it to the prepared cake batter and mix it in. Thanks for all your help! 
I mix the extra stuff seperately then then add it to the prepared cake batter and mix it in. Thanks for all your help!
Yeah I wouldn't do that...but I am no expert...I don't know if that is making the difference or not, but just try to blend it all at once and see if that helps any.
If it's happening when you're trying to take the cake out of the pan it might be that the cake isn't cool. Some cakes, dense ones, cak handle being taken out of the pan straight out of the oven. Sponges and more delicate cakes need cooling down first, until they're fully cold before you take them out.
If it's happening when you're trying to take the cake out of the pan it might be that the cake isn't cool. Some cakes, dense ones, cak handle being taken out of the pan straight out of the oven. Sponges and more delicate cakes need cooling down first, until they're fully cold before you take them out.
Thank you for your advice . All these tips are helpful for my next cake 
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