Can't fetch the latest tiers

Hi everyone, I’m new here and I’ll appreciate any help very much. The plugin on my WordPress doesn’t work correctly. Although I followed all the advice I read here (including disabling caching and even opcache on my server), I’m still not able to refresh the tiers and fetch the actual values. All I see in the drop-down menu are the old membership levels I created initially (they actually even do not exist any longer). Please help me to fix this issue. Thank you!

When you click the refresh button, it does not update the the tiers?

Or do you not have a refresh button next to the tiers?