What might this odd root growth tell me?

Hey!

I have been watering every four/5 days in 7 gallon pots but watering a good amount. about 3.5 gallons water across two 7 gallons and one 3 gallon. I’ve been away for two weeks and having someone else come to water and of the 3, two are showing this type of root growth and the one in the photo was much more pronounced. Just wanted everyone’s take on whether this is a good sign and that I’m growing little Arnold Schwarzeneggers or if this is a sign of underwatering etc. they have been going a day thirsty it seems but nothing tragic.
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Top roots bring in the oxygen in to the plant and also help with stability. Like Nunyabiz said water dropped your soil level. Nunyabiz advice is spot on.
 
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