I really hate that way of writing songs out. If you know the song and how it all fits together, then fine. (If you know the song do you actually need anything?!)
But, seriously, it's way too vague. It doesn't tell you how many beats or bars (there could be two or more chords in a bar) each symbol represents. And, like you are getting confused with, where in a bar the next line actually starts.
True, as the other answer glibly states, you carry on with the last chord shown until you see a change of chord, then play that. But it just isn't accurate and self-explanatory. I couldn't guarantee that I'd play it correctly from that song shown, and I've got a not bad idea of what I'm doing!
And to make it worse, the chords are often not on exactly the right syllable, and with songs that have a couple of chord changes , say at the end of a verse, there's no way on Earth of telling how long each chord lasts. I'm not sorry to say there's quality to this kind of 'sheet music'. Sadly it's low quality!