Stuck position configuration on Seeed T-1000

I have 3 of these setup as Tracker nodes. They are all running firmware 2.7.26. All 3 have Smart Position enabled. Two of them I have setup with a Minimum Interval of Fifteen Seconds. On the third node it refuses to save that Minimum Interval value and no matter what I try it stays stuck at Five Minutes.

Things I have tried:

- Flash it with an erase flash firmware.

- Factory reset it.

- Flashed it with the another firmware.

- Erased it again.

- Turned it off and turned it back on again.

- Reflashed Meshtastic 2.7.26.

- Looked at it sternly.

I don't think a configuration value would have survived all of that. Is there some other setting that is preventing this one from being set lower than 5 min?