Jpez
Down on the left!
PNW have my vote. Running 2 of their posts and not a single niggle. Unlike the One up and several other posts I tried. Love the travel adjust so you can get it juuuust right.If you have a torque wrench, tighten the seatpost collar up to spec. If you don't, or if you have a binding issue when it's tightened, you'll have to do the dance of having it tight enough that the seatpost won't move in the frame but loose enough that it actuates properly.
Worst case you might need to claim warranty. From my understanding Oneup had a number of warranty claims from this issue (the V1 I bought my husband was one of these).
I like the travel adjustment of the Oneup dropper but if I had to choose again I'd probably go BrandX or PNW. For what it's worth, some of the other internal droppers on the market are able to be adjusted with the V1 travel adjust shims.
Also sample of one but re the Brand x the lever is a steaming pile of dog turd. Get something else. Anything else. PNW loam and Wolftooth are my go to levers.