@janecando
The first thing I would suggest, is to close all of the open windows, you may have open. Your mobile device does not have unlimited resources, and eBay's app may use a considerable amount of them.
Second, keep your eyes on your update notices. If there is a problem with the app, eBay should release an updated app, that may clear it up.
Next, Questions about the various apps that are available, are best answered in the Discussion boards. There is a board for iOS (Apple) and another for Android.
Above, click on Discussions, then click on the group your device fits into, or click on a direct link below.
http://www.ebay.com/ios
http://www.ebay.com/android
These boards do have eBay associates who are monitoring the posts.
You can help them answer your questions by adding to your post,
1) the device,
2) the OS version your device is using, and
3) the version of the App you are having difficulty with.
The more info you can relay, the better they can help you.
