Best answer by Mathis
Thanks for getting in touch. It looks like your account has reverted to a free account recently, which made a few of your tracks hidden from your profile.
In order for all of them to appear on your account, you can either upgrade to a Pro plan or delete some other sounds to make space on your account for new uploads.
You can check out what tracks are hidden on your account here: https://soundcloud.com/you/tracks. To delete click to 'view hidden tracks' and hover your mouse over the track for the 'trash' icon to appear.
Hope I was able to clear things up for you!