I got Master Airscrew stealth replacemernt props for my Mini SE and the screws that came with the new props are way too short and the old screws work but the props are very loose. It's like the screw holes are too wide or something.  Cant find any info anywhere on it.  Am i doing something wrong?

Hello, there. We will recommend you use the original propellers for DJI Mini SE.
Here is the link:
https://store.dji.com/product/mini-2-propellers?vid=99651

Best to contact Master Airscrew or just use the OEM props.