What causes period symptoms without period several years after a tubal ligation?

Pelvic pathologies: Endometriosis, pelvic inflamatory disease, uterine fibroids, adenomysosis, uterine polyps, infections, ovarian cyst, gastrointestinal issues , urinary infection etc. There are multiple issues causing period like symptoms.

Hormonal fluctuation: Even though your tubes are ligated, you still continue hormonal fluctuations which would cause menstrual cycles.