You are missing a lot...a lack of knowledge
I guess you have original software, then POI must be same edition with maps and they also need proper licence.
If software is "cured", then the publisher and version are not relevant. Only files in MAP folder need to be same edition unrelated to the software.
When they are separated, then they are not used. Software only search for poi located in POI folder. Name is not important at all, info is read directly from file. Names only serve the owner to see which file/version there is in the device.
Similar situation is for example with fbl/ftr/hnr...etc files....all goes only in one folder - MAP.
But, when you download content, all is separated for
- easier handling
- to precise what they are serving
- and most users do not need it all.
Your device is "crazy" because
- There is not enough memory - Do you need all the possible files? Put only the content of the countries where you really going to travell
- some files are bad
- you put the wrong files
And all these questions are coherent and result from the laziness of new users, who do not bother to read, everything is already described:
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