Hello Timpat,
thanks for your help, but it didn' work. I did as you said (delete, reboot, turn-off, copy, turn-on), but the caches are there (and they are the same). These are all caches I have never even visited.
Insig, I'll try your suggestion and report back. Meanwhile, another note: the caches marked as found are always in the same region of the city. I've included two photos of what I mean. Specifically, there are two areas where all the caches are incorrectly marked as already Found. All the other caches are correct. Also, I have two 1000-caches pocket queries loaded in the GPS (in case that is relevant).
North of Lisbon
West of Lisbon
Any help would be greatly appreciated.