In reply to Removed UserZebdi:
Ah yes probably a better explanation, in some guides 5 is always V. If there is absolutely no mention of "VI" it could be that. I guess someone knowing this particular might be more helpful.
Are there combinations of both? Once again I don't know Lleida but in the Pyrenees, climbing guides often still show that crag climbing is an historical subgenre of mountaineering and the grades would be given according to the original style, say III/6a (made up), III now usually replaced with A3 but I am pretty sure I have some guides (10 year-ish old) that still use roman for aided. I have to check now, as I am getting confused.