If they are only partly out of the ground, that is normal for them. That is how they like to be. They hate being wet and that is a way to be sure they are up out of the damp earth. If the bulbs are getting very large, you can pull them up and divide them. Do not bury them when you plant them though. You want the part where the leaves meet the bulbs out of the soil. They will adjust themselves.
Iris corms normally grow along the surface - in fact, if you bury them, they tend to rot.
if they are so crowded that they are one big mass of root? you can lift the clump, cut away any bad or very worn looking parts, and replant the healthy parts.
Note - if you have a pale purple iris that smells a bit like grape soda? you have one of the varieties of 'sweet flag' that provides perfumiers with 'orris root', and if you're in to potpourri, you can slice clean sections of the roots up for such use.
If you have the time and ambition, you need to dig them up and replant. If you prefer to wait until after next Spring's flowering, you can just mulch them well for this winter.
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Top them with some mulch
That's how they grow and spread. If you cover up the rhizomes they won't bloom.
They're good.
See if these links help you out. Since I live in southern California I jut let them do their thing even if out of season.
https://www.longfield-gardens.com/article/What-To-Do-When-Bulbs-Come-Up-Too-Early
http://www.gardensalive.com/product/spring-bulbs-poking-upin-winter/you_bet_your_garden
https://garden.org/frogs/view/16007/
If they are only partly out of the ground, that is normal for them. That is how they like to be. They hate being wet and that is a way to be sure they are up out of the damp earth. If the bulbs are getting very large, you can pull them up and divide them. Do not bury them when you plant them though. You want the part where the leaves meet the bulbs out of the soil. They will adjust themselves.
(I am assuming you are talking about the big blooming German irises)
Iris corms normally grow along the surface - in fact, if you bury them, they tend to rot.
if they are so crowded that they are one big mass of root? you can lift the clump, cut away any bad or very worn looking parts, and replant the healthy parts.
https://www.wikihow.com/Divide-Bearded-Irises
Note - if you have a pale purple iris that smells a bit like grape soda? you have one of the varieties of 'sweet flag' that provides perfumiers with 'orris root', and if you're in to potpourri, you can slice clean sections of the roots up for such use.
It has been unusually warm for this time of year ,that is why they are coming up again.It is for no other reason
If you have the time and ambition, you need to dig them up and replant. If you prefer to wait until after next Spring's flowering, you can just mulch them well for this winter.