Hi, had a uti and kidney infection now since august 16th nearly a month. i'm on my 4th set of tabs. it came back. is there an underlined problem here?

Yes: Assuming you had your urine cultured and were given an antibiotic based on culture results, the recurrence could mean there is a structural abnormality of the ureter that sets you up for infection. If you were treated without urine culture, you may have a resistant bacteria needing another medication. Ask your doctor if a culture was done. If not, have one done now.