If I add more than 60 items to dropdown list they all disappear (custom field)

Made a custom field. Dropdown menu. Add items to menu, works fine. But once I get over around 60 items, the entire list of items disappear.
Whether I type them in or copy/paste them in.
Have only 2 other plugins, tried disabling them, made no difference

What can I do? I need about 250 items in this pull down list!
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