Product Family: Act!
Product: Act! Premium (access via web)
OS: Windows 10
Browser: Internet Explorer 11
Cause: The cause is currently unknown
There is no known solution for this issue however you can try creating a custom template as a workaround by following the steps in the article below:
How to Customize Labels in ACT!
Answer ID How to Customize Labels in ACT!
The label sizes used in Act! default templates are detailed in the article below:
Default Label Sizes in ACT!
Answer ID Default Label Sizes in ACT!