Error Style tag in head

Hi,

I have an error in the Head tag where an <style> is opened but not closed
So all tags after are not readed because browser thinks this is style like for example meta robots tag

I found where this problem is, it’s echo '<style>'; into the end of class-gpsc-product-slider-carousel-dynamic-styles.php file, but i don’t understand why.

Could you tell me if this is just a mistake ?
Thank’s