Change in SharePoint File Selection Behaviour

Has anyone noticed this in the last week/s?

Basically before, you used to be able to SELECT files without opening them. Now, 5-6 times out of ten, if I try to select a document or folder it opens instead. 
Like, even when i am clearly clicking the checkmark to the left of the file/folder, it will STILL OPEN in the browser, rather than just selecting. 

It's like the file open behaviour has gotten more sensitive or something? It's really frustrating because my users need to add metadata to documents by selecting them, and now they have to fight with SharePoint nearly every time.