Url of the video itself: https://ecchi.iwara.tv/videos/oavqmurvmau6jyweg
The title is fine in the video itself, the problem is in the list of videos.
Simply do like this:
1. Find someone else's video title with an ampersand that looks OK in the video list.
2. Copy and paste the ampersand from that video title to your own video title.
I hope this video title: https://ecchi.iwara.tv/videos/bq8m7czvkhlzw0gy has an OK ampersand for you to copy?
(I noted that I got two styles of apostrophes and quotation marks depending on if I wrote text directly in Aegisub or pasted text from Word or Wordpad into Aegisub. That's how I realised that also ampersands will become various styles ampersands depending on the text source. And only one style seems to cause trouble in Iwara's video titles.)
Why ampersand looks fine in the video, but is broken in the general navigation? Please fix this. It's been years, it shouldn't take that long.
https://ecchi.iwara.tv/users/%E9%9B%A8%E5%86%A0 this is probably the best place to check, ampersand is broken here too.
The < and > are also broken.