Gallery Expiration Won't Change

So I have what I hope is a small problem.
I posted last week about uploading 700 plus sub galleries and I got that sorted out thanks to you guys.
Today I discovered that the gallery was expiring in 30 days.
Nothing I could do would change that. I did some searching and discovered that the Section setting could be changed . I did that for a neew gallery that was being created and it seems to have taken.
The problem is the one that was made 11 days ago wlil not change even though I have gone in and and set the section value to 300 days. It still says Nov 3 2018. iIt appears to allow me to change the date of the individual subgallery but it doesn't stick.
See attached files.

I need to solve this. If I have to delete gallery and reload I can live with that as it is "live" on the site but no one has been given any passwords yet and they don't know what is there.

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Changing the default expiration days won't change in the existing galleries. You would just need to select the expiration date of the gallery like in your first screenshot.

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Thanks.
It worked this time. I tried several times yesterday but it would not change.
Logged in and out and stuff. Whatever??? :-)
It's okay now

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