World Community Grid reports less points in BAM than in their page. The total points reported and points media per day are less. The rest of projects are well reported. It is also wrong in BOINC manager.

I believe what you are recognizing is that WCG does not award points in the same manner that BOINC awards credit (i.e., cobblestones). The "points generated" shown on the "My Contribution" page at the WCG project site is more than the credits granted by BOINC (and therefore reported by BOINCstats and other stats sites). I'm not sure why WCG does it differently, but it's always been that way, as far as I know.

Because WCG used to be part of United Devices. So, the scoring was different. Back then, they didn't want to wipe peoples points clean and start over because it would have angered everyone. So, they continued with a scoring mechanism similar to what they had. Unfortunately, that does not translate to BOINC credits the same. So, if you want to verify you get what you are supposed to, 7 WCG points = 1 BOINC point. They have had fixing the point system on their to-do list for over a decade. Don't expect it fixed soon.