The same is not happening on other parts of the site. I recall having something like this with other parts of the site a few months ago when it was first set up, but can’t recall for the life of me what the solution was.
Turns out the link tag had been modified as you initially suspected. I’m still only fairly new to Kirby and was not quite certain what you were asking earlier, but using the starter kit followed by a process of elimination led me to a file doing exactly what you suggested. The site was initially created by a third party and the link tag override they put in was a bit nonsensical.