RGBW strip recommendations

Not to highjack your post, but I'm wanting to install some LED strips in places too and so far the only place I've done so I have a weird issue that I don't know how to resolve.

I don't really know much about LED strips or powering them so I don't know what could possibly be causing this. It's made me really hesitant to put LED strips anywhere else. If you have any ideas, please post in my other thread.