You may well have a filter on which prevents you from seeing all projects.
There's a small search bar on the right of your projects module.
At its left extremity you'll find the filter engine. If it's green it means there's a filter active. by hovering your mouse on it you'll see which filters, and by clicking you'll be able to change/remove/add filters, and then at the bottom of the filters list you'll have a checkbox to save this as your default filter for your view.