Problems with edge measurements

My model was working fine until I noticed the total difference in edge measurements. As you can see, Red is obviously shorter than Black but Black says it is nearly 1/4 the length of Red. How do I fix this problem?

You are viewing it in perspective mode and maybe with a high zoom so the image is distorted. Switch to ortho mode using ‘5’ on the numeric keypad and see if it looks the same.

I bet you have resized the mesh in one direction in object mode. You have to apply the scale.