Not sure what's wrong...pics plz help

so i started growing this one about 2 months ago, i nute burned it by giving it nutes about a week after planting, but i replanted it in fresh soil about 2 days later. had no problems since then, but now the bottom leaves are all turning yellow and falling off and its starting to go towards the top. the new growth looks lovely but i still dont know why this is happening.
 

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