As often as we can, we allow agents to reserve and complete the same job multiple times at different locations.
However, depending on the needs of our client, we are sometimes only able to allow one completion total per agent. In these cases, reserving one location of a job will cause the others to disappear from your "find jobs" tab. Generally, for example, Buy and Try opportunities are limited to one complete per agent.
To know for sure, you can always reserve a job, then refresh your "find jobs" tab to see if reserving that job excluded others or if they are still available.