The badge shows how filled your calendar is, not how long streak you have. If a new cacher starts logging five cacher each day (and this is a leap year), then after a year they will have a one-year streak (which is the badge The Daily Cacher) but a x5 badge for The Calendar Cacher.

In your case, you have filled all dates in your calendar with at least one find (giving a diamond Calendar badge). Then you have 357 dates with at least two finds (357+366 = 723). Once you make a second log on the remaining nine dates (2017-02-02, 2017-02-04, 2017-02-05, 2017-02-08, 2017-02-20, 2017-02-26, 2017-03-20, 2017-03-21, and 2017-03-30), you will get a x2 badge here.

Thus, Vallafrun apparently has logged at least 10 caches on each calendar date, and is missing 6 dates to get 11. The badge system stops at x9, though, so x9 really means "times nine or more" (which is true for all badges that can be looped).