cache issue

Strange behavior: I use the WP Fastest Cache plugin, and 9 times out of 10, I have to delete the cache for User Switching to work correctly.

When User Switching is not working correctly:
– after switching, it takes me to the home page, https://thesinglegourmet.net
(when working correctly it takes me to the user’s dashboard with the url https://thesinglegourmet.net/dashboard/[username]/?redirect_to=https://thesinglegourmet.net/),
– there is no “switch back” link at the bottom of the home page, or any event pages (made wit The Events Calendar by Modern Tribe)
– when I go to the login page (https://thesinglegourmet.net/login/), it shows the user as logged in, and there *is* a switch back link at the bottom of the page
– I cannot see elements of pages (e.g., tickets) that are restricted to a certain group that the user belongs to (using the Groups plugin), but…
– I can see entire pages that are restricted to users of a certain group that the user belongs to, but the “switch back” link is not at the bottom of those pages

Here are the settings I use for WP Fastest Cache: https://www.dropbox.com/s/8i8kugmw4byv455/Screenshot%202019-09-10%2011.01.46.png?dl=0

Is there a particular setting that you see that might be causing this behavior?

In the meantime, I have disabled the plugin, and now the user switching is working well.

Thanks in advance for your help.

The page I need help with: [log in to see the link]