Question regarding upvote values or amounts

Hi all,
I have found most of my answers on steemit or by googling, but I can't find anything about the upvoting amounts, or more specifically why some people I vote for get something while others get nothing. I'm not sure I'm explaining this correctly but an example is:
I reply to four posts because I find them interesting, I reply, follow then upvote, but some don't get anything while others get between 0.01 and 0.03

I keep everything the same, reply, follow, upvote, out of four people I did this to, the 1st one got nothing, the 2nd one got 0.01 the 3rd got nothing and the 4th got 0.03. Can someone explain to me why this happens, is it just a glitch or does it depend on the person I am replying too, or something else that I'm missing.

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hey! so as you vote, the amount of your vote decreases slightly. I don't really have a solid take on it, but something something 'vote power'. you know what? @nicnas can you please explain? I'm failing.

Hey!!! Thanks for your reply, much appreciate it. I was noticing that some of my votes give out like a few cents, and then others give out none. I know I read somewhere on here that we should limit our votes to like 10 or so a day, is that recommended or just a guideline???

Look forward to @nicnas explanation if they get a chance to do so. Thanks

It could be a few different reasons. The most likely is as beth said above. Voting Power. You are allowed 10 full 100% upvotes a day. So if you upvote a lot the value will go down with each upvote. Or in this case, if there was a lot of time between votes it could have regenerated VP (voting power).
Other possibilities are that you voted on a comment that was passed 6.5 days old. It would have allowed you to upvote but with no value.
EDIT: After looking at your steem power. Your vote is probably less than .01. So what most likely happened was that the comments already had upvotes on them.

Hi Nicnas,

Thank you very much for taking the time to come here and reply to this post, and further explain why this happened, much appreciate that!!

I am still learning the ropes here, and was wondering why some of my votes gave more than others did, this makes sense. So, how could I go about increasing my steem power? Welcome any additional suggestions.. Thanks

Nice and knowledgeable post. keep it up @libby-stories (35)in cryptocurrency

Thanks for posting kissyou, but do you know why this happens? My rewards is set at 50/50 and although not much I do have steem, just don't know why some show nothing while others get something.