Flame Dragon
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Lava Release (熔遁; 溶遁, Yōton; Viz "Corrosion Style" or "Lava Style") is an advanced nature kekkei genkai that combines fire and earth-based chakra to create lava and related substances that can serve multi-faceted purposes.
When used normally, it creates lava like in the Kage Summit.
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However, the earth and fire can be mixed in different ways to obtain different results.
Dodai made rubber.
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Kurotsuchi made cement.
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So the reason Mei lava looks different, it's not because of an animation error or a color change.
She's using a different jutsu!
I think the reason it looks different, it's because, althrough it's still called Lava style, it's acid.
Which i think makes sense, i mean lava would burn too slowly the wood, so she uses acid instead.
TL;DR: Lava Release looks different because it's a different jutsu, it's acid which will corrode the wood quicker.
No animation error or color change.
Hopefully this will stop some of the complaining.