I’ve just installed a new the Shoppica / BurnEngine (1.3.2) theme onto a new Opencart 188.8.131.52 store.
I’m now seeing this error message in the admin page:
Notice: A non well formed numeric value encountered in /home/vuo4jzf4kr8d/public_html/system/vendor/BurnEngine/admin/plugin/SystemPlugin.php on line 153
When trying to save settings colours etc it sits at saving settings.
It appears that the developers no longer support BurnEngine, though they haven’t officially said that (or said anything for a few months), so unfortunately it is unlikely that anyone will give you an answer.