If you use <span> in a section it will not format correctly.
i.e. If your field contains "The <span style="color: blue;">big</span> brown fox"
it will be displayed as
"big The brown fox" with "big" in blue
Perhaps put the word "The" in its own <span> tag.? I tried the Appnitro demo and got it to work correctly.
<span>The</span> <span style="color:blue;">Big</span> Brown Fox