Question about transferring music via USB stick, from a PC to a laptop?

I recently transferred all my music from my PC to my laptop. Most of the songs seem to still be of good quality. However, some of them are jumpy/skipping during playback. All of the music was fine before the transfer. 99% of the music are originally from CDs. It is only an 8GB stick so I had to do it over several times (as my music library is massive).

I’m wondering what happened and if it is because I did it through USB stick? Do I need to re-rip them from disc again? Or can I fix this some other way? I use Windows Media Player for playback.