Serialize after MoveRowDown deletes first row

I have a grid with around ten rows. If I do MoveRowUp, then serialize, all the rows appear in the serialized xml. If I do MoveRowDown, then serialize, the first row is missing from the serialized xml. I’m using the Commercial version of DHTMLX. Thanks for any assistance.

Unfortunately the issue cannot be reproduced locally.
Please, make sure that the ids for your rows are unique and not “0”.

If issue still occurs for you, please, provide with any kind of sample of your code or a demo link, where the issue can be reproduced.