I solved this problem by setting General Configuration > Server Base URL to the same URL I use to access Confluence. We are not using a reverse proxy.
If you are using a reverse proxy, disagreement between the reverse proxy and General Configuration > Server Base URL could very well cause the same problem.
I was able to fix this following the instruction in this link.
My situation happened because we are using reverse proxy and had to include this section in the server.xml - proxyName="confluence.atlassian.com" proxyPort="443" scheme="https" />.
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