I agree with Sander, this looks like the nozzle being too close in combination with the glass not being perfectly flat. If you use a very thin starting layer this will be more visible. Often it doesn't really matter though as it evens out by the 2nd-3rd layer.
Also, too much glue man
welcome to the forums!
How long have you had your Ultimaker 2?
To me it looks like your bed is levelled to high. In this case it results in the bed kinda blocking off the nozzle and preventing it from extruding. That there are some minor extrusion lines can be that there was some minor difference in the bed or the rods are slightly bend and the filament saw some room to escape and relief some of the build up pressure.
I would recommend to lower the bed a little bit and see how that goes!
Link to post
Share on other sites