Hi,
This issue is related with BuddyPress And BBPress Plugin.
But We have checked the code of plugin and customizer . we did not find issue.
Also we have repaired the BuddyPress forum and BuddyPress part , Issue does not resolved.
We have alternate solution for this :
If you want to hide the tittle you can use this custom css in your site:
.groups.forum div#bbpress-forums h3{display:none;}
before css :
http://prntscr.com/ov55yi
refer this after css:
http://prntscr.com/ov55kn
Also if we find any solution regarding this issue we will let you know.