Why didn't my browlift stay in place?

Thank you for your question. It would be helpful to see before and after photos of your procedure. Please keep in mind that you are not necessarily finished with your healing process. I suggest that you move forward and consult with a board certified facial plastic surgeon.
Best wishes,

The vast majority of brow lifts I perform are done completely endoscopic.  This entails Botox injections 2 weeks pre operatively to limit brow motion while you're healing to allow the periosteum to adhere in its new position.  Endoscopic brows require a complete release of this periosteum to place the brow at a higher level.  If you require a skin incision it is done at the hairline within the baby fine hair to camouflage the scar.  Without photos, it's hard to see what's needed--maybe a little upper lid skin excision would help.

It sounds like your minimally invasive brow lift isn't holding.  There is a pretty high incidence of this problem with that procedure as the brow is a dynamic structure and when it is fixed in only a few places, by retention sutures, it doesn't always hold.  You are not rejecting the sutures.  A revision or a conversion to a more traditional brow lift, with a skin excision, may be necessary.