Metabase is an open-source data analytics platform. For new sandboxing configurations created in 1.52.0 till 1.52.2.4, sandboxed users are able to see field filter values from other sandboxed users. This is fixed in 1.52.2.5. Users on 1.52.0 or 1.52.1 or 1.5.2 should upgrade to 1.52.2.5. There are no workarounds for this issue aside from upgrading.