Hello giuliastully,
Thanks for reaching out to us. This is something we’ve seen from time to time.
It is almost always caused by a conflict with another piece of software. Since you did not experience the issue before it could also be affected by the load order of the plugins. First try to deactivate and reactivate all your plugins, and see if that makes a difference.
If that does not help we will need to try some more detailed troubleshooting to confirm a conflict and isolate the conflicting plugin/theme.
To search for conflicts, please follow these steps.
1. First please deactivate all plugins except Easy Pricing Tables and see if the issue persists.
2. If the issue is resolved, reactivate your plugins one by one to see if the issue returns.
3. If no conflict is found among your plugins, try reverting to a default WP theme like ‘Twenty Sixteen’, or ‘Twenty Seventeen’, and see if the issue is resolved.
Head here for detailed instructions:
https://fatcatapps.com/knowledge-base/search-for-conflicts/
Let us know your detailed result, and we will go from there. Thank you.