I think I’ve found the reason : Missing SIDs/STARs or IAPs without runway-idents on some airports
Many Mexican airports have incorrect runway numbers. For example, for MMCL the runways are 20 and 02 in MSFS (and other charts I found on the internet, maybe old ones?). But in Simbrief and Navigraph they are runways 21 and 03.
What’s interesting, though, is that everywhere I look on the internet I see runways 20 and 02, but not 21 and 03. Could the runway numbers in Navigraph be wrong? Even Windy says in “rwys, info” that the runways have the numbers 20 and 02. Is this a recent change? Windy: Wind map & weather forecast