I found out: The problem is caused by DigiMember Plugin. I’m currently working with their support. In addition to this problem though, I am currently working on another major issue between the two Plugins WPML and LearnDash together with their support teams. Following their suggestion, I set up a staging website and it seems to be the case that all these problems are related to the theme Weaver Xtreme! When I change the theme of the staging website (I chose Astra), then all these issues cease to exist. What would you suggest I should do?
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