I am sorry to hear that this is happening. Can you tell me if you are working in a block and saving a block or using the overall Save button at the top of the campaign? Also, can you try testing in another browser or using your current browser without add ons to see if this helps? It looks like you might be using Chrome. You can click on the 3 dashes in the top right corner and click "New Incognito Window" to try a new window with add-ons temporarily disabled. Let us know if this helps or not.