Recent fillers…migration? (Photo)

Thank you for your question and photos.
I am concerned to hear that the practitioner saved the syringe and injected the rest 3 weeks later. That is not following sterility guidelines and possibly exposing you to unnecessary risk of very bad infection called, biofilm.
I always advise patient to choose the practitioner not only for the injections but only for management of any questions or concerns later.I always advise to see your original practitioner, but in this case, I am not confident they are practicing safely.
Based on the photos, the filler has migrated. If it bothers you a lot, consider taking some filler out just in the cupids bow first. Give it 1 month to heal and then decide if you want to add more.
Once the "shelf" has disappeared, these are your following options;1. Try Botox lip flip for upper lip, may affect your pursing ability and only last for 1-2 months but worth a try2. use a different filler next time and avoid injection into the border3. Inject utilizing a different technique.
Art takes time.
All of these should be easily offered by an expert injection provider in your area.Hope this helps a little.Have a beautiful day, Dr. Anna Avaliani , NYC

It does appear that some filler has migrated outside the lip border, which can happen with certain types of filler. If you're noticing this, I would recommend considering a slow dissolving process using hyaluronidase to gradually break down the filler until it no longer extends beyond the vermilion border. Once the filler has settled, it would be a good idea to have a trusted, experienced injector re-administer the filler to ensure more precise results.

When choosing an injector, always make sure to review their before-and-after photos and verify their credentials and education to ensure you're in safe hands for future treatments.

Based off of the pictures you have provided, it appears you were injected using poor technique. It would be best to dissolve your existing filler and start with a clean slate. Find a provider that focuses on creating more volume in the body of your lip rather than the border or surrounding structures.