Related Fields Won't Populate from Related Tables.....

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    I'm going in circles and can't understand why. I've created these three tables. When I exit Layout mode and go to browser after having added fields from the other two tables, the only fields I can enter records into are the fields from the first table. I'm certain I'm doing something simple and obvious, but I've been at this several hours and comparing other files and have had no luck. Suggestions?