Why is textbox resizing acting this way?

Articulate storyline 2

I have a textbox with several variables in it. I want the textbox to resize itself when the variables change, staying at the current font size. These are the settings i have for the textbox.

It is set to resize the shape to fit the text. This is what it looks like with when i publish it with empty variables:

But when a user adds their notes, especially when the notes start getting long, it shrinks the text still!

What am I doing wrong? I want the shape to expand indefinitely in the scrolling panel, but no matter how I set the properties it keeps shrinking the text to fit the shapes current size! Is there a solution to this?

Thanks!

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