site only opens in private window

Links from the Autohotkey forum suddenly do not open properly. This may have started with my recent upgrade to FF 133.0.3. Here is sample link: https://www.autohotkey.com/boards/viewtopic.php?f=14&t=134961&e=1&view=unread#unread If I open this link normally (which, for me, means in a new tab) I am sent to Captcha screen, and upon answering it, then appears only a text outline (not the CSS code) of the page. If I open IN NEW PRIVATE WINDOW, I get the captcha screen again and after answering it, the page opens correctly. (I usually don't get the captcha quiz from Autohotkey forum also, but that may be their doing. I also can state the captcha screen is not because cookies have been erased. I keep most all cookies.) Firfefox.)