When you set the text to at least heading 3 and a minimum enlargement of 175%, the upper part of the text gets cut off.

Issue is reported in: https://h5p.org/node/299681

Test content: https://h5p.org/node/300363 - This shows the configuration above. It is not much but the "i" gets cut off. It is more obvious as the text gets bigger.

Screenshots attached