Premiere Pro Transitions Not Working :(

I've been trying to implement transitions that I've imported from Mixkit into my Premiere project, but the keep messing up.  For one, the blocks are showing as yellow (I don't know what this means), and the effect glitches out—usually dividing in half or qudrants as you can see in my attached video.  For reference, this is what the effect is supposed to look like: https://mixkit.co/free-premiere-pro-templates/twist-transition-203/

It seems I can resolve the issue by rendering that portion of the timeline, but when I try do so that after copy + pasting the transition over my actual video clips, it gltiches out again.  Any adivce would be appreciated!