Problem with size of lightbox-link

i have serveral pictures in my blog item and now that i changed my theme from Antimatter to Helium i have the problem that the box where i can click on to open the lightbox is stretching from on side to the other. i want to save space because with more pictures they all align itself under the previous one. Which looks like this. Bug . I import them with the normal image command with these parameters: (NameofPicture.PNG?lightbox=1920,1440&resize=200,200). In the end i want the pictures aligned like this: B2 I have installed the featherlight plugin