Ted,
Existing entries are not affected by new changes to settings. These settings only take effect when an entry is saved. Once a position is saved (incorrectly) it won’t be overwritten by a changed default setting. The two trips you sent screenshots of are future trips with the FO-PM one being further in the future. If they were already imported prior to when you changed the setting to default CA-PM, they won’t be updated. If you were to delete and reimport those trips, they would reflect the new setting.
For the crew member part, you need to go in settings to the crew member area and designate yourself as default CA and undesignate yourself as default FO. It looks like you’ve already done that by looking at your screenshot, but the same applies as the position section above. The changes won’t take effect until new trips are imported.