Sometimes BPPV requires multiple repositioning manuvers to get corrected. It is possible that sometimes during repositioning manuvers the otolith moves from one canal to another resulting in persistent giddiness post manuver.
Next Steps
you need a proper vng guided repositioning manuver.
Health Tips
can try semonts manuver for right Posterior canal bppv at home with a person with you as these manuvers can provoke giddiness
or
can consult me in person for repositioning manuver