There are two main reasons why it may appear that your contacts, companies, or deals in the HubSpot CRM are disappearing or missing. The record may not appear in the current view or your user permissions may not give you access to it.
1. Check your current view
If your current view includes filters that do not apply to the record that is missing, you will not be able to see it. For example, if you're looking at companies that are only assigned to you (My companies view), you won't see companies that another user created and/or owns. Click the View dropdown and select All contacts, All companies, or All deals to see all records regardless of who owns them.
2. Check your user permissions.
It's possible that your user permissions for HubSpot Sales could be set so that you can only view contacts, companies, or deals that you own. Learn more about this here. If you'd like your user permissions to be adjusted to view all records instead of just contact, companies, or deals you own, you'll need to reach out to your Sales Administrator about making the necessary changes.