Looking at this more closely, the replication of the resource code happens when I select a preset and click 'Apply selected' (I have been assuming that is the process for applying a selected preset.)
Contrary to my above statement, it doesn't happen each time I run an HTML5 export.
Note that if I just keep outputting at the '[Last Document Export]' setting, the resource code replication does not happen.
I guess the expected/desired behavior would be that each Preset has its settings, and when you select and apply it, it just becomes the parameters that were set up in the preset when it was originally created. It should not be adding anything, or at least the HTML Exports window shouldn't have anything changed in the various available setting tabs in that window other than what was created/designated in the preset selected.
Here is a video of what happens.