Grid edit not saving

I have 2 records in a table… when I edit the records individually it saves fine… but when I do same in grid edit nothing saves and it just stays on same screen.
Any ideas?
Or how would I troubleshoot this, have inspected and no network error
Thanks

Show the table schema and list page settings for the problem table. You can also open your generated web application in Visual Studio and add a break point to debug.If you are a registered user, it is probably best to send your project to the support email for quicker resolution.

After quite some testing I have worked out that if the field is set to not list then the save on grid edit works.
If I edit a single record in edit it also works… with and without listThe field is linked to a computed field in sql and so should just update, the list option is blocking the save