Translation:Please wait for a bit.
No, I hadn't noticed that specifically, and this is my second time through. But I have noticed it's a bit rougher than the older courses and it makes sense that since fewer people make it to the later lessons that those would have less refinement. SoI guess just keep giving them feedback and they'll smooth it out. ;)
少しis an adverb and 少ない is an adjective. https://en.wiktionary.org/wiki/%E5%B0%91%E3%81%AA%E3%81%84