Mods can. Not sure if non-mods can or not.
On a computer - do you have the little pencil in the top right of your posts?
If I click on the pencil, then edit topic, it gives me the ability to edit your post or your thread title (if the edited post is the OP).
If you don't have that option it must mean users can't update thread titles. If this is the case - please let me know. Feedback pls.
If you can't update them and want one updated before we can potentially fix it - send me or any other mod a PM on a thread title you want changed and we'll do it for you.