Every week I take my 1yo twins to baby group and every week they (mainly DS) crawl off to do their own thing and won't come back to me when I call them/ look at them and beg whilst maintaining lovely mummy voice. It drives me mad! Everyone else's children sit nicely on their knee or at least go back to their mummies from time to time but mine just seem to want to be independent. Do you think it's because they're twins and are used to being more self reliant? They've always had to share my attention, naturally. I know there are bigger issues but it just makes me a bit sad 
when did your LOs start wanting to come to you when you were out and about??