Why does my phone show more songs in my playlist than my PC

[xba4qklsd]

I was looking at my playlist and I noticed that my phone said it contains 1000 songs. On my PC (Windows 10), however, it claims to contain only 991 songs. Both of these are reasonable numbers but where did those extra 9 songs come from/go? I don't know which is right since I'm not counting 1000 items...