The different Bitnami stacks you installed include all the components they need to run so when you install any of those stacks, you will be installing a new database, web server, ... They do not use the services that another Bitnami stack has installed and those services will be using different ports so that's why you can't access all those applications using just "localhost" (it uses the port 80 by default). During the installation process, you are asked to set a different port in case the default one is in use, do you remember the ports you set? You probably set consecutive numbers so you should be able to use these URLs to access the different applications
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