Why would the Vogue slider change size?

Hi all

I have started setting up a site using Vogue and I have added four posts to the slider. I have set them up with background images and then with text and a logo over the top. The first one I did was perfect, but for the other three, the logo changes size even though I’ve used the same logo image in each post.

The first time I set the slider up I used one category for all four posts. After I saw the image size issue, I changed it so there is a different category for each slider post, but I still have the same issue. Any one have an idea why this would be happening? What am I missing?

Here’s what I’ve tried:
Same size image for background image
Same size image for the logo
One line of text under the logo
Different category for each / same category for all

Any ideas would help! Thanks!