Are the butterflies getting the blue glow that indicates they're within interaction range? If not, try getting closer -- you may even have to jump and hit "Enter" at the proper time (likely to be near the apogee of the jump).
I used to be able to hover my mouse over the butterflies, but that stopped working for me. Once I got high enough in animal kinship I was able to hover and get the milk emblem. If I jumped I could still choose the butterfly and the action massage. I think hovering w/the mouse still works for some people, but not others. When I asked in live help the guide checked it and was able to hover w/the mouse, so I don't think it's a problem that TS can track. I guess you will still have to jump to choose butterflies until you get high enough to be able to skip massage and then hopefully the milk hovering will work for you too.