Re-install OS Mojave

My 'home' folder seems to have been corrupted somehow, I click 'Go' select 'Home' and when the home screen appears it shows the side bar and folders (see screen shot). But when you double click the applications folder it opens and a blank screen appears. But if you click the applications in the side bar the applications appear where the folders are. Does anyone know why this is happening and how to fix it. I have thought about restarting my iMac in recovery mode and erasing the hard drive and reinstalling Mojave. But will I still have the same problem if I use the time machine back up when Mojave is reinstalled? My iMac is a late 2015 and I have been thinking about buying a new Mac. But how do I migrate all my date from the old Mac to the new one without having the problem mentioned above?