Hello,
I am a developer with the DropCatch team and I would really love to get additional information for you so we may troubleshoot this issue. Would you mind DMing me your username and any details that you can, such as full price or discount club, when you are placing them, how long you believe it is taking prior to them 'disappearing'. This is not the experience we want you to have on our platform and all the information you can provide will help our team get to the bottom of it! Thank you