I have a feeling you are right!!! I have 2 pods that are labelled and I think I have them muddled up as I thought 'no need to Lanke them'. Maybe they are lettuce? The 2 that are aubergine are still small and the leaves are a little crinkled. I think I left them in the propagator too long?
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Astrudle I might be wrong, I often am, but the true leaves on your Aubergine don't look like Aubergine to me
Mine are more round and shapely.
They do look more like lettuce
That would explain why your Aubergines look very different to mine Astrudle
I should have clocked it was lettuce, I grew enough of it last year. 
D'oh!