Today was pick up day & I put my can out with a me...

Today was pick up day & I put my can out with a metal plant stand it it. My lid didn't close completely, but I've put it out before the same way, especially when putting grass clipping bags in it with no problem.. Unfortunately it wasn't emptied. On my way to work, I noticed many more cans not emptied, all having 1 similarity, the lids not closed completely. There was 1 can barely lifted up maybe 2 inches. I'm pretty sure these folks weren't too happy, since all these cans were full. If there was a change, maybe a notice about it would have been nice.