Hi @antonisvo,

I hope you are well today and thank you for your question.

It seems happening because of the following CSS code you are using on your site generated by Yellow Pencil editor plugin.

.sh-portfolio-single-buttons .sh-page-switcher a {
    display: none;
}

So to make it work please either remove the above CSS code from your site or try adding the following CSS code in the Custom CSS code option of your theme on the below path.

Admin Area -> Appearance -> Theme Settings -> Custom Code -> CSS Code

.sh-portfolio-single-buttons .sh-page-switcher a.sh-page-switcher-button {
    display: inline-block;
}

Best regards,
Shufflehound team