Users' Google Analytics ID changes when a link opens in new tab

Users' Google Analytics ID changes when a link opens in new tab in Safari browser. The _ga ID changes. For exemple if on the initial page it is GA1.1.1893432208.1708957689 then when I open a product on new tab from there it becomes for ex. GA1.1.1893432208.175467443. User stay on the same site with the same domain. GA proprieties are the same on both pages.
Because of this issue the number of users tracked by Google Analytics is artificially increased. Does anyone have an idea why it may happen and how to fix it?