Question: no error message, but a wrong result

In Maple 2019 it is not possible to change to "1-D Math Input".

But it is possible to convert (right mouse->convert to-> 1D Math Input)

In this mode I get the following results:


> 6/2*(1 + 2);
                               9
> 6/2(1 + 2);
                               3
I have the feeling the 2nd result is wrong.
If I change to "Maple input", I get the following result:
> 6/2(1 + 2);
                               9
 
In this editor, where I write this post, it is possible to insert Maple Math.
If I enter there "6/2(1 + 2)", in the preview is written "3".
and
If I enter there "6/2(1 + 2+9)", in the preview is written "3".
 
The parser gives no error message, but a wrong result.
 
If I enter nonsense, there is the following message "You have entered an invalid Maple expression". 
 
Are you aware of this?
 
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