A nice catch, thats a bug.
I calculated 345 as being everything bought max.
If you go for a t4, it costs 375
For dual t3s, it costs 375 also.
For the 8 points of unlocks, it requires another 200 pps. 575 is the total for a maxed out doctrine.
someone should check my math just to be sure, but thats what I came up with.