Can’t speak for OP although sure he’s doesn’t have both desktop and mobile version in edit mode at same time. Myself have iMac as workhorse whilst often sync to iPad Pro to continue working in garden area or outside house. Had added portion missing couple of times after sync and edit on iPad Pro, now am sure it’s similar to what’s reported above. Drove me crazy not knowing what happened. Likely related to refresh issue reported 4 months ago DTTG 3.8.11 sync refresh bug still not fixed. Also on bandwagon of non-sub apps, rely on DT3 DTToGo3 till they die.