Delete an object in Database

I create and commit an object in a MF and show it in a EDIT page. There is possibility to delete this object in another app with call REST before client changes it in this page. I deleted (without refresh) this object as mentioned (with call Rest) and I see that object is deleted in the page as well. How can that occur and how can I preserve it in RAM?  My expection was that it should be deleted in database but should remain on page. 
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