You are not alone, we've seen this on iOS as well
I thought it would be fixed in relation to this fix in 21.2.0.8:
21.2.0.8 Patch Resolved Issues
AAPP-11909: Generate unique PayloadIdentifier in configuration profile on push.
We're running 21.2.0.14 and the issue still appears, have tried incrementing the version, adding/removing to the mail accounts defined, copying the profile, creating a new one, they all exhibit the same issue.
I've checked the XML of the profile, and all accounts have the same "PayloadIdentifier": <string>(uuid).Exchange ActiveSync</string>.
"Exchange ActiveSync" is the default mailbox name, but all ours are different from "Exchange ActiveSync", so my presumption is that they're reusing the UUID portion and wanted to suffix it with the mailbox name, but for whatever reason keep it suffixes the default name instead, hence only one EAS-profile per iOS profile.