It looks like the overlay for the 4th stage of the "Song" virus is misaligned. It's down and to the right of where it should be, so you see more of the HA base's outline spilling out.

Stage 3 --- Stage 4

I found someone on stage 4 and I think the alignment has been fixed now! [edit] Thanks for posting that info below me, I didn't think about the different bases. The issue isn't on a masculine base.

It's still showing as misaligned for me on the female base.