Over feeding?

Hello I have small birds living near my garden. I recently put up a 500g wild bird feeder. As from pets shop.

https://www.petsathome.com/shop/en/pets/tweet-tweet-full-wild-bird-feeder-500g?weight=500g?utm_source=google&utm_medium=cpc&utm_campaign=google_shopping&cm_mmc=Google-_-CPC-_-%20google_shopping-_-google_shopping&ita=1976&ito=google_shopping&istCompanyId=7255ccad-a1fc-4729-af31-478f79e5071c&istFeedId=385e6b9a-8b03-4076-a8bb-e4737df8549c&istItemId=itiwmpppp&istBid=tzwt&gclsrc=aw.ds&&gclid=Cj0KCQjwoPL2BRDxARIsAEMm9y_OQY1lHfpS66ukeTJrlG92VjwqAauzY0OtcnFDVJME0ObjHjuUFb4aApygEALw_wcB

I put it up 7 days ago and they have taken all off this and I filled with 350g of mealworms within the 7 days. Being inexperienced at feeding wild birds I wondered if they are just taking back to the nest and storing or if they all over indulging. 

I think the birds are either wrens or house sparrows. They chirp away loudly all day. It's quite relaxing.