Problem inserting module in sidebar B or article

When i create and insert FIRST module in article, all ok.
When i create and insert OTHER module in other article, all ok.
When i create and insert THIRD module in THIRD article, NOT SHOW...

For this problem yo leave insert into articles and i try in SIDEBAR of articles... BUT, BUT, BUT

When i create and insert FIRST module in SIDEBAR B, of first article.... all ok.
When i create and insert OTHER module in SIDEBAR B of other article, all ok.
When i create and insert THIRD module in SIDEBAR OF THIRD article, NOT SHOW...

See atached image....

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