@Nalor mine only goes up to 1500 (no artifact), and I had a few that also were odd numbers after consuming vials. If it bothers you, you can let it run until only 50 is left. The next auto fill for the vial will only have 50 sips/sticks/whatever, and then you'll be back down to 0, where you can fill up to 1500.
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refill fluidcache from -serum-
I can never get it past 1450. Is this intentional, or because when refilling it takes 100 at a time and not 50? which also makes zero sense.
You pay 8 gold to add 100 sips of a small wooden cask with traces of a nervine serum to your fluidcache.
[ 1450] a nervine serum