[NW0U]

I have the frequencies figured out for a busy LTR system.
I have listened enough to have the functions of 29 TGs figured out. There are at least that many more that I don't yet have enough listening time to know from their conversations.

But I have some TGID anomalies.

My understanding is that there can be no more than 20 home repeaters. Which suggests that the home repeater number should never be higher than 20.
But I have one TG of 0-23-143 that has enough traffic that I think it is legitimate.
I have also heard audio with 0-26-224 and spoken phrases in 3 different 22-xxx TGs.

I also have a few TGs showing home channel 00. That's certainly wrong, isn't it?

So I'm wondering if the Pro-97 is decoding correctly, or whether the system is transmitting the TGIDs cleanly, or whether there really can be TGIDs with numbers higher than 20.

Ideas?
(No I can't put LTRslicer into use here. My work location won't allow it.)