The last time I responded late I was on vacation too, lol. Hope you had a nice one.
It felt like only a couple posts ago that you were in the frame stage, and now you're at enclosed already, that's good. Not too far off now! Must be exciting.
In my case where enclosed to fixing done is only 9 days apart, I think it may either be due to:
1. They billed me late for the enclosed stage (which I think is unlikely). Or,
2. The fixing work begun while they're still finishing up the enclosed stage.
I suspect it's the latter, as when I did my weekly visit, i haven't been billed for enclosed, but could see taps and whatnots are installed (which should happen during the fixing stage). Hopefully it's be the same for your case so you can go from enclosed to fixing done within a short period.