Some deformation- is this natural?

Hi! My first approach would be to check your pH - of both the feed solution and the runoff. It’s best to collect runoff directly after feeding so you can get the most accurate sample. You don’t necessarily have a “deficiency” of any particular nutrients just because you aren’t doing enough of that nutrient. I find that often, the improper pH level of the nutrient solution can be the culprit, because every nutrient has an optimum range at which the plant consumes it. If your runoff pH is very high, (7.5+) you might require more frequent feeds, with the same dosage of nutrients as before. PH is also best measured together with EC (electro-conductivity). The EC also has an optimal range: for example, during flowering, it can be around 1.9-2.1. When the EC measures higher than expected, this could be for a few reasons; but it ultimately means that there is a buildup of nutrient salts in the growing medium that can also limit the plant’s ability to consume all of the nutrients properly. Hope this helps.. Good luck!