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Hi @jpnl
Thank you for your interest in the Filter Everything plugin.
First of all, do not use one-letter URL prefixes (also make them unique) for filters, second of all do not use AJAX as long as you are not 100% sure that it is filtering without it, so turn it off right now. The free version does not work with the page builders, the PRO version has compatibility with page builders. Also, there may be suspicions that the page is using a custom query, and the free version is filtering only Main Query, and not support custom ones.
Best Regards – Victor