I didn’t [post video] , I don’t know how.
If you post, you may get better feedback. As one guy mentioned, a wrist curl in and of itself is not a stroke flaw that needs fixing if you still stroke it consistently.
In general, without a video, you might be interested in these few facts:
1. The biceps primary role in the arm is not elbow flexion, it is suppination of the forearm/hand (aka wrist curl). So, if you use you biceps to power your stroke, you are using a muscle that tries to turn the hand over.
2. If you get in a fully pronated position (most commonly taught grip postition with thumb-down, palm facing away from target), because of how it connects to the forearm, the biceps will be mostly 'turned off' and just the brachialis, which doesn't also turn the wrist when it flexes the elbow, can power your stroke (IF you power your stroke from within the arm....some don't which always comes as a surprise to those that do).
3. The amount of wrist curl is affected by your stance angle. The same grip (one that is prone to turning over) will def turn over when more square, but as you angle your body more and the elbow comes away from the body, that same grip will not want to turn over nearly as much and may just not turn over at all depending on your body and why the wrist curl is occurring for you to begin with .