Dear List!

I do not know how to solve this issue.

I want the formulas appear on same height, as you can se on the attachment the formula containing a fraction displaces on another vertical position compared to the other equations.

How do I correct this?

Code snippet pasted from garden

\starttext

\startitemize[a,columns,three]
\item $ 56 + 2 \cdot 3 $
\item $ 5-(7) $
\item $ \frac{21}{7} $
\stopitemize

\stoptext


Thanks in advance

Jan-Erik