The exceptions are both words that describe places of origin. Is this a pattern or are these two examples that just happened to be place names. I can see three possibilities:
1) When you have a place of origin adjective (from Spain, from Analusia) you always use gendered plural endings.
2) When you use gendered plural endings for adjectives ending in z or l you always use gendered plural endings
3) It's just a coincidence in the examples and neither 1 or 2 is a pattern.
Which one of these cases is closest to being correct?