Near the bottom of the page in the URL, the list of newsletter is overlapping other content. The reduction shows that the root cause is that WebKit pulls the <form> out of the <table>. Firefox doesn't, and consequently lays out the page without the overlap.
Created attachment 15121 [details] Reduction
I am unable to reproduce this bug in Safari Technology Preview 152 using attached test case because it reports same as other browsers (Chrome Canary 107 and Firefox Nightly 106). <div><form></form></div><table></table> Since all browsers are matching, I am going to close this.