I am using nodebb-plugin-composer-default 4.3.2 and NodeBB v1.4.0.
The problem is present on Lavender and other themes. Looks like it is not related to the theme.
I cannot delete my own topic (this).. when I click on the delete link, it appears a gray rectangle that covers all the page without the possibility to click in the modal window, bug?
Yeah most likely a bug. Think its fixed on master though. Just may not have updated here.