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The ammonia is mainly from the soil, it's part of the main characteristics of active soil substrates, they release ammonia and nutrients initially to kick start and boost plant growth during the tank's startup stage. The lava rocks should be inert and should not be leaching ammonia (unless it's some special type that's specifically listed as containing additional fertilizer content).
2 weeks is usually still too early for the beneficial bacteria to establish a large enough colony to process all the released ammonia (especially in a brand new tank), it'll usually take around 6-8 weeks for a tank to be fully cycled (sometimes longer and sometimes shorter), so just have to wait.
The plants in the tank should be rapidly taking up ammonia and nutrients during this initial period of time anyways, so the more plants you add (preferably fast growing types) the quicker they will use up the ammonia.
The way it works is you should take the opportunity to focus on growing plants and cultivating the scape for the first few weeks, then once the scape and plants are established, and the tank is cycled and stable, then you add in the fishes and shrimps.
More frequent and larger water changes can also help to remove the excess ammonia being released too, though it would be better if you utilize it to grow more plants instead, less wastage of all those valuable and useful nutrients.
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