[DrTobiasFunke]

It's likely that the player was a two-player in college and has two way skills, so that can happen, especially if your Assistant GM has control over your minor leagues. You can always change him back to a SP by right clicking and going to the set position option in the drop down menu, where you can reset him to an SP. If you really want to make sure your Minor league AI doesn't move him back, you can right click and go to game strategy and use the force start/use option and set him to the position you'd like him to use.

edit: as for the scouting report issue, you can either wait for the monthly scouting report to update that information, or assign your scout to re-scout the player. The scout will only do the report on the position he is listed as, so make sure they're in the position you want before that updates.