The heading text (which should be marked up as such), is being affected by the same style because it has the same class attached to it.
<span class="item_dent">Private & Secure</span>
Remove the class if you don't want the style applied.
As I mentioned elsewhere, your code would benefit from the correct use of semantic tags, and you really shouldn't be using HTML tables for layout in 2017.
I also suggest you run the page through the Validator, https://validator.w3.org, as you have a lot of obsolete attributes in there.
I think I may have misread your question. If you are asking why adding the same class with the same padding to both the bold text and the other text does not move both the same distance from the left-hand border, the answer is that there is a 24px wide image to the left of the bold text.
padding-left is applied to the left of the item, not from the left of the containing div.