There is no such thing as a "normal" PSA, and an isolated reading is less important than the overall trend.
Lots of things can influence it, including size of your prostate which is why "free PSA" is tested and why it's worthwhile doing the simple calculation of your "PSA Density" (PSA divided by gland size) to determine what % of the PSA is due to benign enlargement.
There is low grade PIN and high grade PIN which is more relevant. High grade PIN does not mean that you'll inevitably develop PC, but it is a signal to improve life style, and undertake closer monitoring.
Biopsies are not 100% accurate: they can miss small cancers, although this is far less usual with two being done, and readings are subjective: what might seem normal to one could seem more suspicious to another.
With some gray areas, I'd be having another PSA and "free PSA" in a few months, improving lifestyle, exercise, diet, nutrition etc where possible, monitoring more closely, and if there's concern, have biopsies sent for another opinion.