Got curly hair but one side is straight?

Hello everyone!So this is my first post here and I am starting the journey to a better curly hair once and for all and I have this issue where for the past month my left side of the hair is suddently getting straight almost a 2a  while the rest of my hair is curly around 3a. I air dry my hair mostly, only on winter I blow dried for 2 weeks so my hair could have some shape (I have it around chin lenght) but was fine for a while, I have been doing the same thing I always do, same products etc. I read a few posts but they mencioned they blow dried always or styled it which is not my case. Was wondering if it is time to switch products or I am doing something wrong? 

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