Links give me a 404 not found sadly
Ok, fun fact: I have the exact same ID as you on my personal save (I know this can happen, not sure why people tend to get the same ID but not an issue).
Anyway, I don't have the same result as you when using the encounter tool...
For me, Rand 174 is just a normal Tortolodon.
To get a chroma, I have to go to Rand 319.
I think someone had this issue in one of my playtest, but it was a while back, it happened only once on a really old version, and I think the problem resolved itself by doing a hard reset on their save...
I should probably look into it more (I'll add it to the todo list) but I think you should try to fully reset your game using the overall option menu, and then uninstall and reinstall your game...
Sorry, but without knowing what causes the issue, I can't really give more recommendations...
The only thing that comes to mind is that the ID displayed in the encounter tool is not the same as the one being used for calculation for some reason (maybe an issue with how it's saved...). But right now, I have no idea...