Point is there are many different quality .mp3 formats. It sounds like your player may reject the lower quality files. To check the bit rate, right click on the file, click Properties, click Details, check Bit rate. The higher the bit rate, the better the quality. Check the ones that play against the ones that don’t to see if this may be the problem.
If you are burning .mp3 files to CD, you are burning a data CD. If you used a program to burn audio CDs it would burn the tracks as .cda files. It would convert the your files in the process and tell you when the quality is lower than what is required for CD quality. Or at least this has been my experience though the last time I burned an audio CD was about 15 years ago. If I remember correctly a minimum bit rate of 128 is required for CD quality (and older CD players)
There seem to be some free bit rate converters available on the ‘net. You might try some of them.
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