Please consider that this is a conflict with a third party plugin and outside of our support scope. I looked into the link that you shared, and the developer did not give any clue about the problem. We certainly do not override any filter from that plugin as the developer said.
If the developer finds the conflict cause, we will be more than happy to collaborate with the developer. The developer can contact us via info [at] theme [dot] co
We do recommend that you use the MEC plugin, which is a premium plugin but included in our bundled plugins list. For more information click here.