Now we’re on the same page 
I have added the checkbox and got the same issue.
and you’re right, Handsontable is a JavaScript data grid that looks and feels like a spreadsheet - Available for React, Angular, and Vue this is the same issue. It ended up with no fix, just a workaround that hasn’t been reported by the user.
I will investigate this subject. We get an issue from handsontable.js file but this column configuration works in the vanilla version Handsontable example - JSFiddle - Code Playground
It happens only when we set the last column to checkbox cell type (no matter if we use columns or cells method).