For my short test, I simply went from Creek Warehousing to Los Santos Docks and back. When picking your location, the tab states a $33 difference regarding where you start, even though theoretically they're the same distance. No big deal. However, after taking the routes (mind you, legally so no such bonus is given), the actual received amount is $3,000 more than what is stated in the route picking tab.

Starting in the docks:

(https://i.imgur.com/WOp649W.png)

Clearly not given stars, being a legal load:

(https://i.imgur.com/ziA7ptp.png)

Dropping the load to the Creek location:

(https://i.imgur.com/gDLnRU1.png)

Picking the same route, back to the Docks:

(https://i.imgur.com/o4DbsR2.png)

Dropping off the load to the Docks:

(https://i.imgur.com/GjbpLCG.png)

Not quite sure why no numbers match up, at all. Same distance, different pay. Listed pay is different than what you actually get.

Already reported and picked up by a dev 13 days ago - https://github.com/saesrpg/saesrpg/issues/290

Will archive, keep an eye on the git issue.