Differences in positioning of images

[BorisBarrows]

I'd like to understand the rationale behind the positioning of icon_post_report.gif, icon_post_delete.gif, and icon_post_info.gif images. Specifically, these images seem to be positioned 1px higher (on their respective canvases) compared to icon_post_edit.gif and icon_post_quote.gif (or vice versa). Is there a specific reason for this difference?

[P_I]

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