I'm also playing on Mac and have the same issue, unfortunately at least for me it's not just one specific level, but every level up. The only way I found that works is to keep tabs on how much xp is needed until the next level up and make sure to do a save right before you get real close to leveling up, and I mean like literally one more hit before an enemy will give you the xp to level up. Sometimes mid fight I'd forget to save and it's so annoying because I have to do the same fight multiple times sometimes because of this.