hi bigprojectinside, i don’t know how to use those plugin. also if you need to integrate those plugin, you will need to hire someone that make those plugin work with this themes.
can you try to deactivate every plugin that not related with the themes first? i will prefer you do it your self, so in future, you will able to resolve the problem by your own, also to reduce chance that i make a mess with your backend that you may not wanted.
if you using cache plugin, try to clear the cache first before disabling those plugin, it may also the problem.