i have a similar problem in architecture 2013 - i was hoping they would have fixed this by now. as soon as you get 'too many' of any particular detail group then it starts acting like this - and eventually you have to explode every one of them - and that group isnt very useful......
i stopped using detail groups precisely because of this problem way back 2008-9
Using Revit 2015 and this problem still persists! Detail groups are useless for this purpose... would be great to have this fixed.
Hi. I know this is an old thread but I found it researching the same issue. In several of my groups lines would shift an inch, some would stay where I drew them. I don't use Revit full time so there might be a better solution, but when I edited a group and pinned all the lines together, it solved the issue for me.
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