Jogging strollers, particularly those with fixed front wheel can start veering or pulling to the left or right while jogging or strolling with them. Strollers develop this tendency to deviate from a straight line due to many factors. It can be due to a fault on the jogging stroller, low tire pressure, or road condition.
Some jogging strollers like the BOB, have a tracking adjustment fitted. Check the user manual of your jogging stroller, and if it has a tracking adjustment, follow the manufacture’s instruction on how to fine tune the tracking and correct the stroller from pulling to one side.
You can also check that the tire pressures are at the recommended level. Low tire pressures, or having the tires at incorrect pressures are known to be a cause for jogging stroller veering to left or right.