Simplified example:

<p id="number-of-stamps-block">
    I have <input type="number" value="2"/> out of 2 stamps
</p>

With htmlunit 2.36 when we get the text of the paragraph, the value was I have 2 out of 2 stamps
With htmlunit 2.37 the value is I have out of 2 stamps

The value of an <input> is being ignored now. This is regression and it seems like a bug.

Please, let me know if you need more information.