After several years of lurking and having the Flipper Zero rekindle my interest in NFC & RFID, I finally pulled the trigger and had my first install completed a few hours ago!
Totally normal for it to move around slightly as it settles in. I’ve had three x-Series implants so far and they always wind up moving a little bit in the few weeks to it takes to fully settle. A good rule of thumb (of course there are exceptions) is that if it isn’t feeling uncomfortable than you’re good.
The implant will probably shift as the area heals. All 5 of my x series implants have shifted after install, but stayed in the same area. Like Biospoonie said, it should be fine unless it starts to hurt after it’s healed.