Certain icons do not display in custom ribbons. Why?

Have 4 leader types on a drop-down button.

The first 2 icons are displayed. Figured   out that these are 24 bit depth BMPs.  Checked the two icons that were not displayed and found out that they are 8 Bit depth BMPs. Converted these 2 icons to 24 Bit depth BMPs expecting that they would show up. No, they are still not displayed. Updated the cion, removed the button, created a new button and the icon is still not displayed. What is the magic for icons to display?

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