2021 Grow White buds?!?

Here's a video I made of my recent grow, I am a beginner when it comes to growing cannabis and this will be my 3rd or 4th grow in total. I would like to say that I am a medical card holder in my state and have the appropriate grow license for these plants.The strains that are being grown are gorilla glue blueberry x grapefruit and critical cure (CBD). This is the first time I have seen the tops of my blueberry x grapefruit plant produce white buds, only a small section of the bud became white but I am not sure what caused this. If you have an idea leave a comment down below and let me know what you think.