Datagridview - checkbox not working

I have a strange situation where an app is behaving differently for a user on their Android phone than it is on the desktop.

The app has a datagridview bound to a System.ComponentModel.BindingList(Of uiData.Stock). uiData.Stock is a custom object.

The datagrid’s columns are all read only except for the checkbox column.

On the desktop browser, the user can click on the checkbox and the checkbox checked state changes as expected.

In his android phone the state doesn’t change.

This seams to be something that has just recently started to happen.
I can’t reproduce the issue but I don’t know how to get it fixed on his phone.

Can you give any direction as to why the checkbox isn’t working or how I can go about working this out?

Thanks