Blub-Blub

CURA 3.6 and above has been adding lines between the models I try to print. I've also added a pic from CURA 3.3 as that was the last version that has worked for me as 3.4 & 3.5 would randomly send the hot end off somewhere to sit for a couple of hours. My question is, is this something I could have screwed up in a setting or did I stumble upon a bug? If the former, how would I straighten this out? Thanks in advance.