CRJ-700 Captain reported while on intercepting the final approach course the aircraft attempted to make a turn off course resulting in the flight crew overriding the automation and the flight landed safely.

Narrative

On visual approach to XXR; as the PM; I was closely monitoring lateral navigation because aircraft made a slight left turn in the opposite direction; not toward the runway. This heighted my alertness. I understand capturing with the green needle can involve an abrupt intercept angle and staggered wind correction; rather than a smooth transition like when capturing with white needle. Initially we were cleared for the ILS XXR; so the approach mode was armed and both LOC and GS jumped the fence and showed they were captured. The Flight Mode Annunciator (FMA) remained in the correct mode throughout the approach; but the aircraft was not flying consistently with the selected; armed and engaged modes. After observing the aircraft fixing its course and begin turning toward the runway; I assumed it is now capturing as indicated by FMA. However; it once again turned slightly in the wrong direction before correcting itself. Despite the FMA continuing to display the correct mode; the aircraft repeated the turn to a wrong direction; initiating a turn away from the runway. At that point; I took control of the aircraft; disengaged the autopilot; and immediately turned toward the runway. Then; I asked that approach mode be re-armed and the autopilot re-engaged. Then; the aircraft flew correctly according to FMA. I transferred control back to my FO and continued the approach with no further issues.Cause: a delayed response to the aircraft's deviation from its course.Suggestion: Take corrective action earlier to ensure the aircraft does not interfere with the approach path of the parallel runway.