IE10 and treegrid_cell height

treegrid_cell style is defined as:
overflow:hidden; white-space : nowrap; height:"+(_isIE?20:18)+"px;

Why there is a distinction for browsers? In IE10 in my grid some rows are of 20px height while others are 18. The problem does not exists in latest FF.

Please, check the doctype on your page:

If issue still occurs - please, provide a complete demo, where the issue can be reproduced locally.
Here you can find a tutorial:
docs.dhtmlx.com/doku.php?id=othe … leted_demo