Strange, but I too have been looking at it and thinking something didn't ring true.
The strings are central to the pups, neck and wood lines. So, of the 3 screws, the centre one is correct.
Measuring the space from the bridge to each side of the 1st pickup, which I think is pretty true to the line, there's a 2mm difference from one side to the other. The E string side is 15mm. The G string side is 17mm.
If one was to fix it, I'd keep the centre screw as it is, fill the other 2 holes and re-drill them. This would, however, mean that 2 of the mounting screws have holes that may be slightly less secure than they were.
The bass has given pleasure for 40 years. Yes, the bridge is slightly skewed, but does it affect the playability of it? Or the tone quality?
I think I'd leave it as it is.