Perfectly normal the estimate on all sites is based on how fast you solve each share. Sometimes you solve them sooner than average sometimes you solve them slower.
I remember worrying about the same thing when I had 200 mhs. Worry more about keeping it running 24/7 and watching your miner doesn't crash or hang
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P's add a backup pool
Thank you sir! I've got more power on the way, just trying to learn as much as I can while I'm waiting on parts!