Form Button Font Keeps getting smaller

[flea333]

Every time I click on this form button in my spreadsheet the text gets a size smaller until its unreadable. When I adjust the button size it returns to normal size.
What is this all about?

[Aussiebear]

Maybe post the workbook with the form containing the button, so we can see what is actually happening?

[GTO]

If at all possible, in .xls format for those of us who have ye olde excel...