There are ways to upvote automatically, this happens because it is more profitable to do so. However, the next hardfork will make voting later (hopefully after posts have been read) the same as voting earlier curation reward-wise.
I have added you to the list, welcome!
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It makes more sense now. Thanks
This wasn't the case here but hard to find the time to reply to people when you're voting on so many posts per day as I am currently. :p