I placed my first cake on top of the bottom cake and I measured and all and looks like the legs are 1/2" taller on 2 of the legs could it be that the cake needs more weight added on? My cake is 4" tall icing and all.
I have two more cake to put on top do you think that the weight will even it out? Is too late to try straws now.

I wonder if my 7/8" ribbon will hide the small gap between tiers?

You may need to cut the legs to even them out. Take them off the plate and line them all up. If they aren't the same length, you need to cut them to size. Good luck!

Cut the legs to match.