Hi Dark Beccio,
In order to achieve the functionality you want, the dataType column is recieving must be a number, but in your case its a string .
Also I have used this demo for testing:
I have tested the grid with a column with cellsFormat: ‘c2’ and value as the one from your post and there is no rounding up of the value.
Please, do not hesitate to contact us if you have any additional questions.
Best regards,
Yavor Dashev
Smart UI Team