The market in Kingserpool (5837,1153) has a productivity between 108% and 5375%, changing about once per second. 42000+ Fruit are in transit.
Looks like an electricity thing. Max Boost is 32%, actual boost is up to 5200% and more. There is a UAR transformer to the east of the market (near the shore), with matching consumption patterns.
Personally, I blame wind turbines.
I came across this bug in another factory in Kingserpool and it can be seen here:
Kingserpool Convenience Store Power Bug.gif