Thanks for the cool addon. After the latest updates, the ability to customize class icons on the health bar, namely Personal Resource Style as before, has disappeared. You change the values, but the icon does not move, please return this opportunity.

If you are referring to the button that used to exist under the Class Icon & Personal Resource options. This was removed because they were redundant, as the option to move these now exist in a better form in the Theme Customization.
If this isn't what you were referring to, as you also mention changing the values and the icon not moving. Make sure you are editing the correct profile when in the Theme Customization, because I couldn't find any issues with them when I tested it out.

where can you customize the class icon as you wish? its size and position relative to the strip of life above the enemy’s head?

Interesting, could have sworn I had removed the button for Personal Resource as well, but at the bottom of the profile page there's a button labeled Theme Customization, from there you can find this under the Widgets section.

Found it, thanks!