Not at all surprised, could have been as low as 5000. What does surprise me is that they would release an album right away, instead of starting off with a digital single to build back up a fandom (like they did with pre-releasing Dumb Dumb a couple months before the XOXO album).
On the positive side, the difference seems to be largely the result of having no China Bar sales and the GP is still interested in Somi (Fast Forward climbed up from about #95 to #50 in a week), so the sales will probably have a longer tail as Somi continues promoting.
If Somi doesn't dig herself out of this ditch TBL will probably push her even more into being an influencer, or into a group. Somi stated that she is still hungry for making music, so she has some work to do.
Update:
1st-day: 9411
1-week: 28,935
2-week: 52,612
1-month: 61,881 * new solo-career peak (XOXO - 60,988)
Selling and charting better after a two year hiatus. Never count Somi out.