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It seems a gravatar problem, not related to Stack Overflow.
Your big avatar (https://www.gravatar.com/avatar/efef01b733b5e8af2d8670efe6990e90?s=328&d=identicon&r=PG) is bright green:
Your small avatar (https://www.gravatar.com/avatar/efef01b733b5e8af2d8670efe6990e90?s=32&d=identicon&r=PG) is ...