'Code working correctly only in incognito mode

I created an owl carousel with many items in it. I use javascript fetch to get data and then i insert the data in this items. The problem is that this works only for the items that are displayed on the screen when the page loads. If i scroll to the next item which is hidden at first then the data are missing. The weird thing is that this doesn't happen if i open the website in incognito mode. Everything works perfect there. How is it possible for a code to work correctly only in incognito mode? The website is this https://bet-prognostika.com/ and the carousel is on top of the homepage. The season overall number and the number in front of new pick(s) are the ones that i insert using fetch.



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