Datepicker in completely wrong position

[crunchtime-ali]

I've just installed ember-datepicker via ember install:addon ember-cli-datepicker

As you can see in the screenshot it is completely in the wrong position. The container's position is absolute and relative to 0,0 as it seems (its like (-500,-200) or when I change its position in my form oftentimes even completely off screen. What can I do to get it below the actual input-field?