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It just returns to that position for center? In the case of the latter, it's stick drift, get used to it if you're going to replace those things on the controllers. They are calibrated after they are made, and swapping them will most times cause them to be offset like that. There are more than a few ways to correct it. https://www.acidmods.com/forum/index.php/topic,44643.0.htmlIf it's stuck in that position, clean the board up good and measure the voltage on the center pin of each POT and see what it is while moving the stick around.
Each controller is calibrated after it's made with the sticks that are in it. No two of those things are exactly the same because of the mechanical and electrical tolerances of the stick. So they calibrate the controller to the ones that are in it after it's made, and then changing the stick out will most times result in the thing being a little bit 'off' from how it originally was. Yes you can replace tons of them and never see the issue, but as soon as you run across a controller that was calibrated with a so-so stick in it to start with, then no 'normal' stick will ever center back up in the thing without being messed with. You could go thru 100 sticks before you ran across one that was 'off' in the same way that the original one it was calibrated with so it would match up close enough. You'll need to pick whatever method you prefer to correct the stick drift on that thing to get it closer to the center values now.