Chickadees are like that. I don't know if your other tits are that stuck up. Mine turn their beaks up at the feeder when there are no sunflower seeds. When there IS black sunflower seed, they'll snatch it from the feeder even when I'm standing three feet away. Pigeons and squirrels don't seem to matter to them - those fellows are on the ground. The cat who sits under an ornamental cedar and watches (is this like cat porn?) doesn't even bother them.

Most of the birds (not the finches) tend to ignore the feeder when there are more natural types of eats available. I think your tits are probably fine, Liz. I think they're just roaming a bit but will eventually return.