Smart Rendering pos -1

When I enable smart rendering (dynamic) and I get the url parameter pos, the value being passed is -1 and when I get count, count=1. Why is pos=-1?

It is pretty strange, I double-checked the source code and there is no even theoretical possibility to have pos parameter equal to -1
The only way when something similar may occur - when grid has multiline mode enabled, and initial height of grid is equal to 0 ( which may occur if grid container is hidden or have not any height specified )

If problem still occurs for you - please provide a code snippet used for grid initialization or some kind of demo link, where issue can be reconstructed.