radio station won't upgrade

[RennerCat]

I keep trying to upgrade the radio station. I have watched it upgrade to each level, but it still says only one upgrade was done. It shows 1 of 4 every time.

[CommanderABab]

I keep trying to upgrade the radio station. I have watched it upgrade to each level, but it still says only one upgrade was done. It shows 1 of 4 every time.

Yes, only one upgrade at a time. Each upgrade is simply to change the influence of the radio station.

[RennerCat]

I've done it in all my cities before. You aren't understanding me. It's not showing it has been upgraded.
If I did 3 out of 4 upgrades, it should say 3 of 4, not 1 of 4.
Once an upgrade is done it says, "already upgraded" in green writing.
.

[JustAnyone]

Other buildings usually do support more than 1 upgrade, but radio stations only support one at a time