In this case, you need to edit some iTunes configurations, let us drive you through, step-by-step. We will need to make sure that Apple Lossless is the default import configuration.
- In the iTunes app on your computer, choose Edit > Preferences, click General, then click Import Settings.
- Choose Apple Lossless Encoder from the pop-up menu.
- Now, go to Songs and select everything > click File and then convert (to Apple Lossless).
This will make a new version of everything, meaning you can just order by modified date to delete the old ones.
Rather than all being identical bitrates, they should now be variable. The files should now play and skip just like anything else.
We hope this guide has proven that anything is fixable with a little bit of effort :)