Circuit composer RX or RY gate disappears

When I specify the RX or RY gate to rotate by say $pi/4$ in the circuit composer, the gate disappears off the circuit. Is there any reason why if I leave it with $pi/2$ default then it stays?

If I edit theta the gate disappears.

Here’s some screenshots to show what happens:

Ok solution is to erase the whole field $pi/2$ and reenter $pi/4$ but leaving $pi/$ and then denominator $4$ will not work. Also the denominator is bounded between 1 and 9.