CAS simplification issues

[Cristian Arezzini]

This might just be a trivial mistake that I made in the setup.. but... look at this screenshot, taken in the CAS screen. The first two lines are OK, and behave as expected. But why isn't the third line simplified? On the 50g I get 3*a, which is what I expect.
Also, on the Prime, if I enter sqrt(3*a^2), I get -a*sqrt(3). On the 50g I get |a|*sqrt(3) which is more consistent with the math I learned in college.
So, what's happening? Is it a setting or a bug?