1) Good catch, I'll try to replicate that edge case
2) Are you certain this is what's going on, or are buffs just stacking to give the appearance of tripling? If it happens again please submit your Player.log so I can track it down.
Yeah, Endless Mode still needs a general balancing pass - writing's still the primary focus of development for now, but by the time the next public version rolls around I'll find time to work on that plus the long-awaited AI revamp.
Lavender's definitely scarier than she looks - or even than the poor girl's willing to give herself credit for. =P