Happens with us too:
eg: Γνωμη για αγορα μπουζουκιου μεσω ιντερνετ και εκτίμηση - Μουσικά Όργανα - Ρεμπέτικο Φόρουμ
Strangely, it only happens when you hit the topic from the “latest” list. When you link to it from another topic, it works just fine.
The full link:
https://rembetiko.gr/t/%CE%B3%CE%BD%CF%89%CE%BC%CE%B7-%CE%B3%CE%B9%CE%B1-%CE%B1%CE%B3%CE%BF%CF%81%CE%B1-%CE%BC%CF%80%CE%BF%CF%85%CE%B6%CE%BF%CF%85%CE%BA%CE%B9%CE%BF%CF%85-%CE%BC%CE%B5%CF%83%CF%89-%CE%B9%CE%BD%CF%84%CE%B5%CF%81%CE%BD%CE%B5%CF%84-%CE%BA%CE%B1%CE%B9-%CE%B5%CE%BA%C/38511/2