According to the stat cards, the M26 and M26E1 have a max turret rotation speed of 21 deg/sec, while the T26E5 and T26E1-1 have 24, which makes no sense as their turrets are heavier and all of them have the same engine.
Am I missing something?
“This site is for general discussion of the game. If you believe there is a bug or other issue you need to go to the bug reporting site and make a report there”
something like that will be commented by a gamemaster/moderator
You will need concrete evidence/data for the report to be valid though, regardless of how much sense the report makes without it
For issues of this kind you will need to find sources that prove that what is modeled in-game is incorrect compared to the vehicles real life counterpart.

If you have sources then you can make a historical report for it.
You can report it here: Gaijin.net // Issues (just search a bit first so that you don’t report something that is already reported and known about)
A guide on how to report can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)