Ornery
I am level 81 in offensive elemental magic. I just had a level 46 Gingo resist me 9 times in a row.
I believe it is the spell level that used in resist calculations, not your elemental level. That said, like other so called random events in Ryzom, I believe there is a problem with serial autocorrelation in resists. In other words, once a mob (or players) starts to resist, it seems to get a bonus to continue resisting.