that window is listing the different locations where it finds copies of the same samples, so apparently you've saved the sample along with different projects saved on your Dropbox (Wicked, On the Run, This Moment, Young Again, etc...).
This isn't necessarily an issue, you can just select one of those, typically the one that corresponds to the project you're loading, and move on with your work.
However it's may not be necessary to save multiple copies of the same custom DMD kit, so you could save it once somewhere in your library and then no longer include it for each one of the projects where you use it.