same here, my plate cracked after 9 days of normal use with the honest lighter that came with the lotus, the plate was not so much discoloured but the crack did happen, from the first day on there was only a dark spot that came on the circle around the center (not the small circle in the middle but the circle around that one approx. 1cm dia. ), then the spot whent longer and darker each day and finally after 9 days, while vaping on the lotus, the ring cracked, if you look at
@FlyingLow 's pictures from his cracked plated, the crack looks quite exactly the same how mine was?!? unfortunately i returned mine and did not make a pic.... now hoping the new plate i got last friday, will make it, it already is becoming blueish on the edges of the circle but not black like before, one other thing, is that, on the first one and on the new one, the inner circle is slightly deforming since the first use/heating like it is lower on/nearer to the bottom on one half of the center of the plate?! maybe that is causing steess on the plate, maybe the holes of the screws are a bit to far away, one of the other and are stretching the plate when heating/cooling etc,,,, maybe, i wondered, it could also be the og honest lighter, because sometimes the flame is growing fatter when using, even newly filled with extre torch lighter gas,,,?! questions over questions my fellow vaporists :-) lets medicate over this issue :-) prayers and medication :-) lotus calling......