Because the player you see have the same level for the other manager of level 44.
The players have no assigned attributes until the player is sold, if you see him 5*, the other manager see it too as a 5*, once the player goes to your club, is a 5* for you, if goes to the other club, is a 5* from the other manager viewpoint so, you see him as a 5* for your club, that at your level is 45 points of avq, but* + 38Levels of differance x5 points that is the distance between a star and the next one, thats +190, so this 5 starts player you see with 45 of quality in your Club will be, 45+190= 235AvQ, that is the level, of the 5th star at his level.