Are pcr tests prone to false positives when diagnosing bacterial infections?

Every test has false positives and negatives. Look up the data on the specific test you are talking about

Any test can have false positives. Some bacteria are less likely to give false positive results, e.g., tuberculosis. All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Wish you good health!