Failures to permanently SAVE grammar/spelling IGNORES

[PeteNick69]

(Using MSWord loaded on laptop -- NEVER cloud) I have personally-created documents of <100 pages that behave very differently. These docs are basically lists of persons and short bio paragraphs OR lists of items with short descriptions -- NO special formatting. Some docs completely accept and permanently save IGNORES of spelling and/or grammar (at least until para/entry is next re-edited). Others appear to accept and save (at least as viewed on screen), but after closing & reopening, at least some IGNORE items are again underlined in either/or/both BLUE & RED. I must have designated an ignore for certain name-spellings dozens of times -- to no permanent success. I can't figure what I have or haven't done differently in the different docs. Is there maybe some limit on the number of customizations per doc? I would like to make some Ignores PERMANENT -- even if later near a new edit, but don't know how. For names/words/multi-strokes "added" to my dictionary, there are instances when I still get blue grammar underlines when later re-used. I think the grammar of something ADDED to dictionary shouldn't keep repeatedly being challenged -- but don't know how to prevent repeated challenges. And I can't figure out if words/stokes added to dictionary/ies refer to me as a user in all docs or just to a specific document, and I don't seem to be able to designate one or the other.