Access Options - Set number of days not sticking

Clicking on Access Options under a membership, then change to finite access. Defaults to 1 day. I try to change to 5 days, and it won't stick. I can change it to week and this will stick, but any number entered to change the number of days/weeks, etc. does not save. It will show changes save (per screenshot), but when I go out and come back in, it shows 1 again.

I have deactivated all other plugins and switched to Twenty-fifteen theme to rule out conflicts and the issue persists.