The CSS selectors are loaded multiple times as verified by me. I guess your query is more about why the CSS is not taking effect.
Firstly, I see two elements with id meu-acc specified in CSS – the Accordion heading element and the accordion element itself. Secondly, the data-section selector does not apply to any element since there is no element with this data attribute.
If you are trying to style individual accordion elements, pls use nth-child selectors to target individual elements like this –
#meu-acc .lae-accordion .lae-panel:nth-child(1) { color: red; }
#meu-acc .lae-accordion .lae-panel:nth-child(2) { color: blue; }
#meu-acc .lae-accordion .lae-panel:nth-child(3) { color: green; }