Page content doesn't load correctly in Incognito only (works after changing IP or using a VPN)

Hi everyone, I'm a website owner and not very technical, so please bear with me. One page on my WordPress site does not display correctly for me in a Firefox Incognito window: https://towalisoviejo.com/blog/towing-with-a-tow-strap/ What happens: - In Incognito, the page content sometimes doesn't load correctly. Refreshing doesn't fix it. - It only happens in Incognito. In a normal Firefox window the page looks fine. - Sometimes it starts working again if I change my IP address or turn on a VPN. - It is not constant. Some times it loads fine and other times it doesn't. My questions: 1. What could cause a page to break only in Incognito? I know extensions are disabled there and there is no saved cache or cookies, but I don't understand why that would change how the page loads. 2. Why would changing my IP or using a VPN make it work? Could this be a caching, DNS, or network issue on my side, or does it point to a problem on the website's side? 3. What is the best way for a beginner to find out what is failing? I opened Firefox DevTools but I'm not sure what to look for in the Console and Network tabs. If someone can tell me what errors or failed requests to look for, I can share screenshots. 4. Is there anything I should test first, like clearing DNS cache, trying another browser, trying mobile data, or turning off Chrome's secure DNS or other settings? I'm using firefox on windows. Thank you so much for any help.