In the Appylar documentation, it says:

Make sure to check the device size before setting the "banner_height" property to "90". For devices with screens smaller than 728 device independent pixels (points), always use banners with the height "50". Otherwise, the banner size will default to 320 x 50 points.

Based on your screenshots, it looks like your device is narrower than the 728 device independent pixels needed to show banners with the height 90px. The fact that the View is 90px high is just to provide a predictable outcome since you are expecting the banner to occupy 90px on the screen.