I have multiple slide down notes that aren't working. I have notes connected with "Linknext", selected as "Slide Down", and even set the end fret (ctr + shift + L) and the slides still aren't working. I have slide lines highlighted with purple that are working but the slides that aren't working have a black line instead of purple. Any ideas? https://www.dropbox.com/s/o41oslvei0v92au/slidesOnPurpleOffBlack.png?dl=1

The black lines means that it's an unpitch slide that is set which is slightly different than the usual slide.

See this guide for reference of how it shows up in game :

https://imgur.com/a/vlxTS

I just deleted the notes and created new ones and now they work once I selected as "Slide Down" and set the end fret (ctr + shift + L).