when the value is small, Calculation doesn't work

hello, I use the grid. I set c7=c5*c8/100, when c8 is small ,for example c8=1.2 or c8=1.3,Two kinds of cases get equal value. if c8 is big,It is normal. why? how can solve it?

That issue was fixed.
Please, open ticket at support.dhtmlx.com so we can provide you a fixed file.