1- open both editform.aspx and dispform.aspx in SharePoint Designer.
2- copy the webpart code from incorrupt page to corrapt one inside WebPartPages:ListFormWebPart tag.
3- if the corrupt page is editform.aspx change ControlMode from Display to Edit and FormType from 4 to 6 and if your corrupt page is dispform.aspx do it vice versa
4- Save your file and close the Designer
I highlighted those parts you need to change:
<WebPartPages:WebPartZone runat="server" FrameType="None" ID="Main" Title="loc:Main"><ZoneTemplate>
<WebPartPages:ListFormWebPart runat="server" __MarkupType="xmlmarkup" WebPart="true" __WebPartId="{CF23ABCB-183A-4333-9E4F-898160A14A94}" >
<WebPart xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.microsoft.com/WebPart/v2">
<Title>پیشنهادات و انتقادات</Title>
<FrameType>Default</FrameType>
<Description />
<IsIncluded>true</IsIncluded>
<PartOrder>1</PartOrder>
<FrameState>Normal</FrameState>
<Height />
<Width />
<AllowRemove>true</AllowRemove>
<AllowZoneChange>true</AllowZoneChange>
<AllowMinimize>true</AllowMinimize>
<AllowConnect>true</AllowConnect>
<AllowEdit>true</AllowEdit>
<AllowHide>true</AllowHide>
<IsVisible>true</IsVisible>
<DetailLink />
<HelpLink />
<HelpMode>Modeless</HelpMode>
<Dir>Default</Dir>
<PartImageSmall />
<MissingAssembly>وارد کردن این جزء وب ممکن نیست.</MissingAssembly>
<PartImageLarge />
<IsIncludedFilter />
<ExportControlledProperties>true</ExportControlledProperties>
<ConnectionID>00000000-0000-0000-0000-000000000000</ConnectionID>
<ID>g_cf23abcb_183a_4333_9e4f_898160a14a94</ID>
<ListName xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">{437B63DD-D5CE-4C66-8931-21318AD31AF2}</ListName>
<ListItemId xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">0</ListItemId>
<ControlMode xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">Display</ControlMode>
<ListItemId xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">0</ListItemId>
<ControlMode xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">Display</ControlMode>
<TemplateName xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">ListForm</TemplateName>
<FormType xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">4</FormType>
<ViewFlag xmlns="http://schemas.microsoft.com/WebPart/v2/ListForm">1048576</ViewFlag>
</WebPart>
</WebPartPages:ListFormWebPart>
</ZoneTemplate></WebPartPages:WebPartZone>