That hasn't been a thing since before I joined Steem in 2017.
Not sure what you were experiencing you aren't really giving me much information.
There are a couple of reasons why the reward pool might get inflated but rewards have pretty much always been linearly based on powered up stake.
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I was referring to what I thought was a larger increase in curation rewards when I went from 1000 Steem to 2000 Stee. The reward increase seemed to more then double. So for a while I ran a project where I would combine other peoples Steempower into a voting account which seemed to deliver larger rewards.
But it could have been for some other reason like timing of my vote, since that was also a deciding factor at one time, and the subject of discussion and change with the hardforks.