Deformed citrus lives can definitely be caused by leaf miners. It is also very common for new leaves to be deformed by insects, such as thrips or aphids, feeding on young leaves at the very earliest stages of growth. This type of damage can be avoided by spraying the new growth with either a horticultural oil, soapy water solution, or even a strong water spray to remove the insects. Spraying every couple days to remove the insects eliminates the problem. Once the leaf is damaged it will remain damaged throughout its life.