A sticky mind and a great voice

The regular feedback form I have to give to students (3rd year business undergraduates) usually brings very similar types of comments. But this semester I got a new one (ponto fraco):

"Very sticky to her mind."

I'd love to know what it meant to that person, but the feedback's anonymous. The same person made another comment I haven't had before (ponto forte):

"Great voice."

I'm not sure how helpful they are in terms of feedback, but as post-it notes for my identity I aprreciate them all the same!