I may be wrong, but I think that’s indicating “swing 8ths” - Swung 8ths.
I don’t think that’s the problem - the tab doesn’t show note duration, so I can’t tell how long any of the notes are. Is that first measure a quarter with an 8th rest then 2 8ths, 8th rest and a quarter? Or an 8th with an 8th rest then a quarter, 8th, 8th rest and a quarter? I don’t know… You’ll have to figure it out by listening to the song, I guess…
I can’t tell much from your screenshot, but you can’t see an official tab unless you have a membership. So if the link is to the official tab, you won’t see anything without the membership.
What you need is the actual music. They’ve put the rests in there but no indication of the duration of the actual plucked noted. Here’s the first line in actual music and you can see that the beats in a measure now add up: