Which API endpoint are you seeing this on?
Fyi this call...
/networks/{networkId}/appliance/uplinks/usageHistory
...duplicates the cellular uplink interface on some devices, there's a case open with Meraki support.
The last test I did showed it only happening on one MX67 (out of 39 in the org), it used to happen on more devices, so I assume work to fix it is making progress.
If you're seeing similar behaviour on a different endpoint I suggest open a case,