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Hey! I am running a blog named  prowatersoftener.com Today DA of my blog decreased what could be the reason Please help me what about issue?

HI, i want to know how MOZ DA increase or decrease. My Website: https://yesornogenerator.com/  has 8 DA according to MOZ but sometimes it goes back to 5 and then increase to 8. There is no change on backlinks so how this happens.