Sorry i am new to SharePoint and this could something small i am doing wrong. But this is driving me crazy i can’t figure out what is actually happening.

I will explain with screen-shots. So i have a Wiki-page when i Check out it and edit it is displayed differently, the page if not checked-out display different content when it is checked-out.

Step 1. Clicked on the Site Contents

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Step 2. Clicked on the highlighted page, page is shown as below enter image description here

Step 3. Page is shown like a below in edit mode:

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Step 4: Clicked on Save and then Check In the following error:

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Log file against Correlation ID:

Area : SharePoint Foundation Category : Logging Correlation Data Level : Medium EventID : xmnv Message : Name=Request (POST:http://sharepoint.globalrescue.com:80/memberservi ces/Wiki%202/Member%20Services%20HOME.aspx)

Area : SharePoint Foundation Category : Authentication Authorization Level : Medium EventID : agb9s Message : Non-OAuth request. IsAuthenticated=True, UserIdentityName=0#.w|globalrescueskhan, ClaimsCount=43

Area : SharePoint Foundation Category : General Level : High EventID : 6t8h Message : [Forced due to logging gap, cached @ 11/13/2017 00:17:38.06, Original Level: Verbose] {0}

Area : SharePoint Foundation Category : Authentication Authorization Level : High EventID : ajmmt Message : [Forced due to logging gap, Original Level: VerboseEx] SPRequestParameters: AppPrincipal={0}, UserName={1}, UserKye={2}, RoleCount={3}, Roles={4}

Area : SharePoint Foundation Category : Files Level : High EventID : 00000 Message : UserAgent not available, file operations may not be optimized.
at Microsoft.SharePoint.SPFileStreamManager.CreateCobaltStreamContai ner(SPFileStreamStore spfs, ILockBytes ilb, Boolean copyOnFirstWrite, Boolean disposeIlb) at Microsoft.SharePoint.SP FileStreamManager.SetInputLockBytes(SPFileInfo& fileInfo, SqlSession session, PrefetchResult prefetchResult) at Microsoft. SharePoint.CoordinatedStreamBuffer.SPCoordinatedStreamBufferFactory. CreateFromDocumentRowset(Guid databaseId, SqlSession session, SPFileStreamManager spfstm, Object[] metadataRow, SPRowset contentRowset, SPDocumentBindRequest& dbreq, SPDocumentBindResults& dbres) at Microsoft.SharePoint.SPSqlClient.GetDocumentContentRow(Int32 rowOrd, Object ospFileStmMgr, SPDocumentBindRequest& dbreq, SPDocumentBindResults& dbres…

Area : SharePoint Foundation Category : Files Level : Medium EventID : aiv4w Message : Spent 0 ms to bind 5275 byte file stream

Area : SharePoint Foundation Category : Files Level : Medium EventID : ahjkm Message : Spent 0 ms to send 5275 byte file stream

Area : SharePoint Foundation Category : Logging Correlation Data Level : Medium EventID : xmnv Message : Site=/

Area : SharePoint Foundation Category : Monitoring Level : High EventID : b4ly Message : Leaving Monitored Scope (PostResolveRequestCacheHandler). Execution Time=233.329227461563

Area : SharePoint Foundation Category : Files Level : Medium EventID : aiv4w Message : Spent 0 ms to bind 29296 byte file stream

Area : SharePoint Foundation Category : Monitoring Level : High EventID : b4ly Message : Leaving Monitored Scope (Wiki Edit OnInitComplete). Execution Time=17.2227323456845

Area : SharePoint Foundation Category : Authentication Authorization Level : Medium EventID : aib3w Message : SPShareByLinkHandler.IsShareableByLink : ShareByLink disabled at SPSite or tenant level