Anyone had abnormal pap smear?

To

Ive had 4 pap smears.. all abnormal. First 3 were low grade changes then i went to the colposcopy clinic and it said high grade changes. So they took a biopsy and it came back totally normal.

Anyone experienced this whats it mean? I gotta go back August 4th for another colposcopy. Which is more reliable... the abnormal pap smear result or the normal biopsy result?