How to set acf color field as background color to product category

The style-attribute is not in the span-tag, but should be. Further you are using the php opening tag inside of the echo tag (copy-paste?).

change

'<span class="termek-oldal-kategoria-teszt"> style="background-color:<?php the_field('kollekcio_szine'); ?>"'

to

'<span class="termek-oldal-kategoria-teszt" style="background-color:'.get_field('kollekcio_szine') . '">'

(sorry, I would have commented, but I don’t have enough reputation)

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