I have one site on my SharePoint 2013 server where the Quick Edit function of lists seems to be corrupt. For example when a bulk of data is copied from Excel to a list in Quick Edit view the first line is saved and on the second one SharePoint is not able to save the data. I checked all the data in the list and made some tests but nothing worked.
Today I got the issue that when the user of this site adds a task to a tasklist with main and subtasks, SharePoint doesn't save the data (which was inserted manually). I also tested this issue. It seems that SharePoint is not able to save the data cause the "Working on it" screen doesn't disappears:
When I click on "Leave anyway" the data i inserted is in the list.
Has anybody an idea what the error could be or how to find the error? Many thanks in advance!