Page Layout ⇒ Text not in first line when pageheight small

[Perry123]

Hello, I'm trying to render a little textbox with pdflatex
(custom-sized with the geometry package). The example below
produces the expected result: horizontally centered "text"
in the first line. I also show the margin for better orientation.

Code: Select all

\documentclass[8pt]{extarticle}
\usepackage[papersize={250pt,80pt},margin=5pt,nohead,nofoot]{geometry}
\geometry{showframe}
\pagestyle{empty}
\setlength{\parindent}{0pt}
\begin{document}
\centering text
\end{document}

However, when I change the page height from 80pt to below 77pt,
the "text" moves away from the top margin; at 60pt, it is roughly
vertically centered. How can I fix this so that it remains at the
top even for shorter pages?

Thank you for any ideas.

[Perry123]

Ok, I'm feeling stupid now. The problem apparently goes away when I remove the \geometry{showframe} command. Seems to be a bug in geometry.