While submitting on edit form , Saved data from that item gets cleared or all the fields are set as blank

We have created a SharePoint List with custom new/edit forms created using sharepoint designer. Forms contains javascript/jQuery for validation and creating list items in another list based on some criteria. After executing some custom logic, i call this function WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$ctl41$g_83ec93a1_2957_4829_9ddd_7cb2ec085483$savebutton1$ctl00$diidIOSaveItem", "", true, "", "", false, true)) to save the updated values on edit form. But in some cases, all the values from that list item is getting cleared(Previous data is no longer available). 

Also to be noted, most of the fields on the form are marked ReadOnly(Not disabled) by setting readonly="readonly" property using javascript. 

Any help on this issues would be appreciated.

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-Manjot