jQuery Grid Plugin - jqGrid

It's not a bug. jqGrid send always rowid parameter as id parameter. See the documentation. On the other side jqGrid provide you prmNames option which almost you to rename almost all parameter which will be sent by jqGrid to the server. By usage prmNames: { id: "myId" } will rename the id name used during editing (delete too) to myId.

One other thing, in small code fragment which you posted, looks not good: you use name having special meta-charackter "." (see here). It's not good. I would recommend you better to use name value which have no dots, spaces and other. Instead of that you can use typically jsonmap to read input JSON data, but you can still use name with more better value. Exact implementation could depends on other parameters which you use in jqGrid and from the exact format of input data. Just try to use

colModel: [
    { label: "ID",   name: "id",   jsonmap: "groups.id", key: true },
    { label: "Name", name: "name", jsonmap: "groups.name" }
]

Best regards
Oleg