Hi there
When I check your site, the theme seems to not load intermittently.
There may be something else installed on the site that’s causing problems. The quickest way to figure out if something is interfering is to test for a theme or plugin conflict.
I know it’s less than ideal, but could you please try the following:
– Temporarily deactivate all the site’s plugins except for Jetpack and clear your browser’s cache.
– Then try to activate extra sidebar widgets again. If it works, then we’ll know that another plugin is conflicting here. You can re-enable your plugins one by one, testing in between, until you find the one causing the conflict. You can leave it disabled or reach out to the plugin developer for a fix.
If disabling plugins doesn’t help, it may be the theme.
– Temporarily switch your theme to a WordPress default theme like Twenty Twenty. Then try to activate extra sidebar widgets again. If it works, then you know it’s a problem with the theme, and you can reach out to the theme developer for a fix.
Let us know how that goes.