Joining a league part way through a season is a disaster. The design you have been given is correct and has been this way for years.
Assuming you have a a 5 star CD and joining an Elite tier, for each race completed in the league you join, you will receive 4.5dp for your CD strength, 1.5dp for CD weakness and 3dp for the remaining 6 attributes.
You joined after two races were completed so your core design (before supplier and TD modifiers are applied) will be:
9dp for Braking
3dp for Reliability
6dp in the remaining six attributes.
You should also have received 6dp to spend where you want.
Total dp is therefore 48 already assigned and 6 you can choose where to assign = 54dp.
Compare this with the other teams in the league who will have started the season with 480dp. Add to this 60dp to from their design HQ (assuming Level 30) and approx. 20 dp from research, giving them a total of 560dp in comparison to your 54. You can see why most managers only join a league in the season break.
The current rules were introduced nearly 7 years ago and have remained pretty much unchanged since.
New Design Balancing system when changing leagues
