I follow MS Wish List, which aggregates agents' (and editors') tweets about what manuscripts they would like to see. Could you explain why an agent closed to queries would be actively updating their wish list and saying "send me your ____"? Is it just a pipeline issue? I find this practice very confusing.
You're supposed to be confused.
We do that on purpose.
It's a great way to torture writers, and you know we live for that.
**clattering noise as telex machine coughs up urgent missive to shark**
I guess *I* am the only one who likes to torture writers.
OTHER nicer agents don't. *telex catches fire like it was message to Mr. Phelps*
So driving you nuts is collateral damage to Lots of Available Information!
Because there is no central clearing house of info about agents not every update makes it to every site.
When I closed to queries a couple times I tried to update all the sites, my website and my blog.
I STILL got queries. Lots of them.
I still get queries addressed to me at FPLM, a place I haven't worked since 2016.
When I closed the office of a literary agent, I answered queries to an agent who'd been retired for two years and dead for another.
In other words, the amount of time I'm willing to devote to keeping my details current is shrinking because it doesn't seem to actually make any difference.
But, if you're a careful, organized writer (my favorite kind by the way) what you need to know is what to pay attention to FIRST.
The highest priority is what the agent herself says. If "Felix Buttonweezer is closed to queries" is the Twitter name, well, that means Felix ain't reading. Query accordingly.
The #MSWL list is often assembled by people NOT the agent. When I searched it just now, there are agents listed who've been out of the industry for more than a year.
To answer your question: the reason this happens is that there is no single data base of information, and information on the many data bases is only as good as the people updating it.
As always give higher priority to the information found at the source.
And of course the first rule of querying is me first.