mystery merge request count of 1 but no merge requests

Summary

The repository in question shows 1 merge request on the left sidebar, however, there are no open merge requests listed for the repository.

It was cloned from github a day ago.

Steps to reproduce

Sorry I have no idea how to reproduce it.

Example Project

https://gitlab.com/Project-FiFo/FiFo/vmadm/merge_requests?scope=all&utf8=%E2%9C%93

What is the current bug behavior?

The number of merge requests on the left sidebar does not reflect the number of open merge requests

What is the expected correct behavior?

The numbers match

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com